diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..97fe952
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,18 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_style = space
+indent_size = 4
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[Makefile]
+indent_style = tab
+tab_width = 4
+
+[*.go]
+indent_style = tab
+tab_width = 4
+
diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
new file mode 100644
index 0000000..043238c
--- /dev/null
+++ b/.github/CODEOWNERS
@@ -0,0 +1 @@
+@remychantenay
diff --git a/.github/workflows/main.yaml b/.github/workflows/main.yaml
new file mode 100644
index 0000000..48d3ce7
--- /dev/null
+++ b/.github/workflows/main.yaml
@@ -0,0 +1,39 @@
+name: Main CI
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Set up Go
+      uses: actions/setup-go@v4
+      with:
+        go-version: '1.21'
+
+    - name: Install golangci-lint
+      run: go install github.com/golangci/golangci-lint/cmd/golangci-lint@v1.54.2
+
+    - name: Install govulncheck
+      run: go install golang.org/x/vuln/cmd/govulncheck@latest
+
+    - name: Linting
+      run: make lint
+
+    - name: govulncheck
+      run: govulncheck ./...
+
+    - name: Testing
+      run: make test
+
+    - name: Upload coverage reports to Codecov
+      uses: codecov/codecov-action@v3
+      env:
+        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..53d5582
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,11 @@
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+*.test
+*.out
+vendor/
+.DS_Store
+.idea
+.vscode
diff --git a/.golangci.yml b/.golangci.yml
new file mode 100644
index 0000000..9e4aae1
--- /dev/null
+++ b/.golangci.yml
@@ -0,0 +1,10 @@
+linters:
+  disable-all: false
+
+linters-settings:
+  goimports:
+    local-prefixes: github.com/remychantenay/otel-tag
+
+run:
+  timeout: 10m
+  modules-download-mode: readonly
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..d645695
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
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+      and distribution as defined by Sections 1 through 9 of this document.
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+      outstanding shares, or (iii) beneficial ownership of such entity.
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+      communication on electronic mailing lists, source code control systems,
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+      "Contributor" shall mean Licensor and any individual or Legal Entity
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+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
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+
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+      You may add Your own copyright statement to Your modifications and
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+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
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+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
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+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
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+      file or class name and description of purpose be included on the
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+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..b1f0e60
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,13 @@
+default: test
+
+.PHONY: lint
+lint:
+	golangci-lint run ./...
+
+.PHONY: test
+test:
+	go test -race -count=1 ./...
+
+.PHONY: bench
+bench:
+	go test -bench=. -benchtime=100x
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..3cf4a73
--- /dev/null
+++ b/README.md
@@ -0,0 +1,13 @@
+# otel-tag
+Simple package that extracts OpenTelemetry span attributes from a struct based on tags.
+
+## Shortcomings
+- Do not support embedded structs.
+
+## License
+Apache License Version 2.0
+
+TODO
+- Shit! What about attribute name prefix???! Init?
+- Remove t.Log() calls in tests
+- Complete README.md with example
diff --git a/baggage.go b/baggage.go
new file mode 100644
index 0000000..274e97c
--- /dev/null
+++ b/baggage.go
@@ -0,0 +1,49 @@
+package oteltag
+
+import (
+	"reflect"
+	"strings"
+
+	"go.opentelemetry.io/otel/baggage"
+
+	"github.com/remychantenay/otel-tag/internal"
+)
+
+// BaggageMembers takes in a struct and spits out OpenTelemetry baggage members
+// based on the struct tags.
+func BaggageMembers(res any) []baggage.Member {
+	structValue := reflect.ValueOf(res)
+	structType := structValue.Type()
+	fieldCount := structValue.NumField()
+
+	if fieldCount == 0 {
+		return nil
+	}
+
+	members := make([]baggage.Member, 0, fieldCount)
+	for i := 0; i < fieldCount; i++ {
+		tag := internal.ExtractTag(structValue, i)
+
+		if len(tag) == 0 || tag == valIgnore {
+			continue
+		}
+
+		var omitEmpty bool
+		before, after, found := strings.Cut(tag, ",")
+		if found {
+			tag = before
+			if after == valOmitEmpty {
+				omitEmpty = true
+			}
+		}
+
+		field, value := structType.Field(i), structValue.Field(i)
+
+		member, zeroValue := internal.BaggageMember(field, value, tag)
+		if !zeroValue || !omitEmpty {
+			members = append(members, member)
+		}
+	}
+
+	return members
+}
diff --git a/baggage_test.go b/baggage_test.go
new file mode 100644
index 0000000..5ffdb6b
--- /dev/null
+++ b/baggage_test.go
@@ -0,0 +1,85 @@
+package oteltag_test
+
+import (
+	"context"
+	"testing"
+
+	"go.opentelemetry.io/otel/baggage"
+
+	oteltag "github.com/remychantenay/otel-tag"
+)
+
+func TestBaggageMembers(t *testing.T) {
+	t.Run("when non-zero values - should add all members to baggage", func(t *testing.T) {
+		const wantMemberCount = 12
+
+		m := model{
+			ValStr:          "a_string",
+			ValInt:          42,
+			ValInt64:        42000000000,
+			ValFloat32:      3.14,
+			ValFloat64:      99.718281828,
+			ValBool:         true,
+			ValStrSlice:     []string{"a_string_1", "a_string_2", "a_string_3"},
+			ValIntSlice:     []int{1, 2, 3},
+			ValInt64Slice:   []int64{100000, 200000, 300000},
+			ValFloat32Slice: []float32{1.1, 2.2, 3.3},
+			ValFloat64Slice: []float64{4.4, 5.5, 6.6},
+			ValBoolSlice:    []bool{true, false, true, false},
+		}
+
+		members := oteltag.BaggageMembers(m)
+		bag, _ := baggage.New(members...)
+		ctx := baggage.ContextWithBaggage(context.Background(), bag)
+		bag = baggage.FromContext(ctx)
+
+		memberCount := len(bag.Members())
+		if memberCount != wantMemberCount {
+			t.Errorf("\ngot %d members\nwant %d", memberCount, wantMemberCount)
+		}
+
+		for i := range bag.Members() {
+			t.Log(bag.Members()[i].Key())
+		}
+	})
+
+	t.Run("when zero values and omitted - should not add members to baggage", func(t *testing.T) {
+		const wantMemberCount = 1
+
+		m := model{ValBool: true}
+
+		members := oteltag.BaggageMembers(m)
+		bag, _ := baggage.New(members...)
+		ctx := baggage.ContextWithBaggage(context.Background(), bag)
+		bag = baggage.FromContext(ctx)
+
+		memberCount := len(bag.Members())
+		if memberCount != wantMemberCount {
+			t.Errorf("\ngot %d members\nwant %d", memberCount, wantMemberCount)
+		}
+	})
+
+	t.Run("when zero values and not omitted - should add members to baggage", func(t *testing.T) {
+		const wantMemberCount = 1
+
+		m := struct {
+			ValStrNotOmitted string `otel:"val_str_not_omitted"`
+		}{
+			ValStrNotOmitted: "",
+		}
+
+		members := oteltag.BaggageMembers(m)
+		bag, _ := baggage.New(members...)
+		ctx := baggage.ContextWithBaggage(context.Background(), bag)
+		bag = baggage.FromContext(ctx)
+
+		memberCount := len(bag.Members())
+		if memberCount != wantMemberCount {
+			t.Errorf("\ngot %d members\nwant %d", memberCount, wantMemberCount)
+		}
+
+		for i := range bag.Members() {
+			t.Log(bag.Members()[i].Key())
+		}
+	})
+}
diff --git a/benchmark_test.go b/benchmark_test.go
new file mode 100644
index 0000000..0c8d49c
--- /dev/null
+++ b/benchmark_test.go
@@ -0,0 +1,87 @@
+package oteltag_test
+
+import (
+	"context"
+	"testing"
+
+	oteltag "github.com/remychantenay/otel-tag"
+	"go.opentelemetry.io/otel/attribute"
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
+	"go.opentelemetry.io/otel/sdk/trace/tracetest"
+	"go.opentelemetry.io/otel/trace"
+)
+
+var (
+	traceExporter *tracetest.InMemoryExporter
+	tracer        trace.Tracer
+)
+
+func init() {
+	traceExporter, tracer = setUpBenchmarkTracer()
+}
+
+func setUpBenchmarkTracer() (*tracetest.InMemoryExporter, trace.Tracer) {
+	exporter := tracetest.NewInMemoryExporter()
+	traceProvider := sdktrace.NewTracerProvider(sdktrace.WithSyncer(exporter))
+	tracer := traceProvider.Tracer("benchmark-tracer")
+
+	return exporter, tracer
+}
+
+func BenchmarkSpanAttributes_With(b *testing.B) {
+	traceExporter.Reset()
+
+	b.ResetTimer()
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			m := model{
+				ValStr:          "a_string",
+				ValInt:          42,
+				ValInt64:        42000000000,
+				ValFloat32:      3.14,
+				ValFloat64:      99.718281828,
+				ValBool:         true,
+				ValStrSlice:     []string{"a_string_1", "a_string_2", "a_string_3"},
+				ValIntSlice:     []int{1, 2, 3},
+				ValInt64Slice:   []int64{100000, 200000, 300000},
+				ValFloat32Slice: []float32{1.1, 2.2, 3.3},
+				ValFloat64Slice: []float64{4.4, 5.5, 6.6},
+				ValBoolSlice:    []bool{true, false, true, false},
+			}
+
+			_, span := tracer.Start(
+				context.Background(), "operation-name",
+				trace.WithAttributes(oteltag.SpanAttributes(m)...),
+			)
+			defer span.End()
+		}
+	})
+}
+
+func BenchmarkSpanAttributes_Without(b *testing.B) {
+	traceExporter.Reset()
+
+	b.ResetTimer()
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			_, span := tracer.Start(
+				context.Background(), "operation-name",
+				trace.WithAttributes(
+					attribute.String("val_str", "a_string"),
+					attribute.Int("val_int", 42),
+					attribute.Int64("val_int64", 42000000000),
+					attribute.Float64("val_float32", 3.14),
+					attribute.Float64("val_float64", 99.718281828),
+					attribute.Bool("val_bool", true),
+					attribute.StringSlice("val_str_slice", []string{"a_string_1", "a_string_2", "a_string_3"}),
+					attribute.IntSlice("val_int_slice", []int{1, 2, 3}),
+					attribute.Int64Slice("val_int64_slice", []int64{100000, 200000, 300000}),
+					attribute.Float64Slice("val_float32_slice", []float64{1.1, 2.2, 3.3}),
+					attribute.Float64Slice("val_float64_slice", []float64{4.4, 5.5, 6.6}),
+					attribute.BoolSlice("val_bool_slice", []bool{true, false, true, false}),
+				),
+			)
+			defer span.End()
+		}
+	})
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..944894b
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,17 @@
+module github.com/remychantenay/otel-tag
+
+go 1.23
+
+require (
+	go.opentelemetry.io/otel v1.31.0
+	go.opentelemetry.io/otel/sdk v1.31.0
+	go.opentelemetry.io/otel/trace v1.31.0
+)
+
+require (
+	github.com/go-logr/logr v1.4.2 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	go.opentelemetry.io/otel/metric v1.31.0 // indirect
+	golang.org/x/sys v0.26.0 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..60fcc68
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,27 @@
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/go-logr/logr v1.2.2/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
+github.com/go-logr/logr v1.4.2 h1:6pFjapn8bFcIbiKo3XT4j/BhANplGihG6tvd+8rYgrY=
+github.com/go-logr/logr v1.4.2/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
+github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
+github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
+github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+go.opentelemetry.io/otel v1.31.0 h1:NsJcKPIW0D0H3NgzPDHmo0WW6SptzPdqg/L1zsIm2hY=
+go.opentelemetry.io/otel v1.31.0/go.mod h1:O0C14Yl9FgkjqcCZAsE053C13OaddMYr/hz6clDkEJE=
+go.opentelemetry.io/otel/metric v1.31.0 h1:FSErL0ATQAmYHUIzSezZibnyVlft1ybhy4ozRPcF2fE=
+go.opentelemetry.io/otel/metric v1.31.0/go.mod h1:C3dEloVbLuYoX41KpmAhOqNriGbA+qqH6PQ5E5mUfnY=
+go.opentelemetry.io/otel/sdk v1.31.0 h1:xLY3abVHYZ5HSfOg3l2E5LUj2Cwva5Y7yGxnSW9H5Gk=
+go.opentelemetry.io/otel/sdk v1.31.0/go.mod h1:TfRbMdhvxIIr/B2N2LQW2S5v9m3gOQ/08KsbbO5BPT0=
+go.opentelemetry.io/otel/trace v1.31.0 h1:ffjsj1aRouKewfr85U2aGagJ46+MvodynlQ1HYdmJys=
+go.opentelemetry.io/otel/trace v1.31.0/go.mod h1:TXZkRk7SM2ZQLtR6eoAWQFIHPvzQ06FJAsO1tJg480A=
+golang.org/x/sys v0.26.0 h1:KHjCJyddX0LoSTb3J+vWpupP9p0oznkqVk/IfjymZbo=
+golang.org/x/sys v0.26.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/internal/baggage.go b/internal/baggage.go
new file mode 100644
index 0000000..616cf9a
--- /dev/null
+++ b/internal/baggage.go
@@ -0,0 +1,92 @@
+package internal
+
+import (
+	"fmt"
+	"reflect"
+	"strconv"
+	"strings"
+
+	"go.opentelemetry.io/otel/baggage"
+)
+
+// BaggageMember creates and returns an OpenTelemetry baggageMember for the provided field.
+// Also returns a boolean that indicates whether or not the field's value is a zero-value.
+func BaggageMember(field reflect.StructField, value reflect.Value, memberKey string) (baggage.Member, bool) {
+
+	switch field.Type.Kind() {
+	case reflect.String:
+		v := value.String()
+		m, _ := baggage.NewMemberRaw(memberKey, v)
+		return m, v == ""
+	case reflect.Int:
+		v := value.Int()
+		m, _ := baggage.NewMemberRaw(memberKey, strconv.Itoa(int(v)))
+		return m, v == 0
+	case reflect.Int64:
+		v := value.Int()
+		m, _ := baggage.NewMemberRaw(memberKey, strconv.FormatInt(v, 10))
+		return m, v == 0
+	case reflect.Float32, reflect.Float64:
+		v := value.Float()
+		m, _ := baggage.NewMemberRaw(memberKey, strconv.FormatFloat(v, 'f', -1, 64))
+		return m, v == 0.0
+	case reflect.Bool:
+		m, _ := baggage.NewMemberRaw(memberKey, strconv.FormatBool(value.Bool()))
+		return m, false
+	case reflect.Slice:
+		switch field.Type.Elem().Kind() {
+		case reflect.String:
+			if s, ok := value.Interface().([]string); ok {
+				m, _ := baggage.NewMemberRaw(memberKey, strings.Join(s, ","))
+				return m, len(s) == 0
+			}
+		case reflect.Int:
+			if s, ok := value.Interface().([]int); ok {
+				sStr := make([]string, len(s))
+				for i, v := range s {
+					sStr[i] = strconv.Itoa(int(v))
+				}
+				m, _ := baggage.NewMemberRaw(memberKey, strings.Join(sStr, ","))
+				return m, len(s) == 0
+			}
+		case reflect.Int64:
+			if s, ok := value.Interface().([]int64); ok {
+				sStr := make([]string, len(s))
+				for i, v := range s {
+					sStr[i] = strconv.FormatInt(v, 10)
+				}
+				m, _ := baggage.NewMemberRaw(memberKey, strings.Join(sStr, ","))
+				return m, len(s) == 0
+			}
+		case reflect.Float32:
+			if s, ok := value.Interface().([]float32); ok {
+				sStr := make([]string, len(s))
+				for i, v := range s {
+					sStr[i] = fmt.Sprintf("%f", v)
+				}
+				m, _ := baggage.NewMemberRaw(memberKey, strings.Join(sStr, ","))
+				return m, len(s) == 0
+			}
+		case reflect.Float64:
+			if s, ok := value.Interface().([]float64); ok {
+				sStr := make([]string, len(s))
+				for i, v := range s {
+					sStr[i] = strconv.FormatFloat(v, 'f', -1, 64)
+				}
+				m, _ := baggage.NewMemberRaw(memberKey, strings.Join(sStr, ","))
+				return m, len(s) == 0
+			}
+		case reflect.Bool:
+			if s, ok := value.Interface().([]bool); ok {
+				sStr := make([]string, len(s))
+				for i, v := range s {
+					sStr[i] = strconv.FormatBool(v)
+				}
+				m, _ := baggage.NewMemberRaw(memberKey, strings.Join(sStr, ","))
+				return m, len(s) == 0
+			}
+		}
+	}
+
+	return baggage.Member{}, true
+}
diff --git a/internal/internal.go b/internal/internal.go
new file mode 100644
index 0000000..f545f5c
--- /dev/null
+++ b/internal/internal.go
@@ -0,0 +1,13 @@
+package internal
+
+import (
+	"reflect"
+)
+
+// tagName used by this library.
+const tagName = "otel"
+
+// ExtractTag extract the tag's value of a given Struct field index.
+func ExtractTag(value reflect.Value, index int) string {
+	return value.Type().Field(index).Tag.Get(tagName)
+}
diff --git a/internal/span.go b/internal/span.go
new file mode 100644
index 0000000..b1103b7
--- /dev/null
+++ b/internal/span.go
@@ -0,0 +1,63 @@
+package internal
+
+import (
+	"reflect"
+
+	"go.opentelemetry.io/otel/attribute"
+)
+
+// OTelAttribute creates and returns an OpenTelemetry span attribute for the provided field.
+// Also returns a boolean that indicates whether or not the field's value is a zero-value.
+func OTelAttribute(field reflect.StructField, value reflect.Value, attrKey string) (attribute.KeyValue, bool) {
+
+	switch field.Type.Kind() {
+	case reflect.String:
+		v := value.String()
+		return attribute.String(attrKey, v), v == ""
+	case reflect.Int:
+		v := value.Int()
+		return attribute.Int(attrKey, int(v)), v == 0
+	case reflect.Int64:
+		v := value.Int()
+		return attribute.Int64(attrKey, v), v == 0
+	case reflect.Float32, reflect.Float64:
+		v := value.Float()
+		return attribute.Float64(attrKey, v), v == 0.0
+	case reflect.Bool:
+		return attribute.Bool(attrKey, value.Bool()), false
+	case reflect.Slice:
+		switch field.Type.Elem().Kind() {
+		case reflect.String:
+			if s, ok := value.Interface().([]string); ok {
+				return attribute.StringSlice(attrKey, s), len(s) == 0
+			}
+		case reflect.Int:
+			if s, ok := value.Interface().([]int); ok {
+				return attribute.IntSlice(attrKey, s), len(s) == 0
+			}
+		case reflect.Int64:
+			if s, ok := value.Interface().([]int64); ok {
+				return attribute.Int64Slice(attrKey, s), len(s) == 0
+			}
+		case reflect.Float32:
+			if s, ok := value.Interface().([]float32); ok {
+				s64 := make([]float64, len(s))
+				for i, v := range s {
+					s64[i] = float64(v)
+				}
+
+				return attribute.Float64Slice(attrKey, s64), len(s64) == 0
+			}
+		case reflect.Float64:
+			if s, ok := value.Interface().([]float64); ok {
+				return attribute.Float64Slice(attrKey, s), len(s) == 0
+			}
+		case reflect.Bool:
+			if s, ok := value.Interface().([]bool); ok {
+				return attribute.BoolSlice(attrKey, s), len(s) == 0
+			}
+		}
+	}
+
+	return attribute.KeyValue{}, true
+}
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..489e5e8
--- /dev/null
+++ b/main.go
@@ -0,0 +1,6 @@
+package oteltag
+
+const (
+	valIgnore    = "-"
+	valOmitEmpty = "omitempty"
+)
diff --git a/main_test.go b/main_test.go
new file mode 100644
index 0000000..fb731e7
--- /dev/null
+++ b/main_test.go
@@ -0,0 +1,16 @@
+package oteltag_test
+
+type model struct {
+	ValStr          string    `otel:"val_str,omitempty"`
+	ValInt          int       `otel:"val_int,omitempty"`
+	ValInt64        int64     `otel:"val_int64,omitempty"`
+	ValFloat32      float32   `otel:"val_float32,omitempty"`
+	ValFloat64      float64   `otel:"val_float64,omitempty"`
+	ValBool         bool      `otel:"val_bool,omitempty"`
+	ValStrSlice     []string  `otel:"val_str_slice,omitempty"`
+	ValIntSlice     []int     `otel:"val_int_slice,omitempty"`
+	ValInt64Slice   []int64   `otel:"val_int64_slice,omitempty"`
+	ValFloat32Slice []float32 `otel:"val_float32_slice,omitempty"`
+	ValFloat64Slice []float64 `otel:"val_float64_slice,omitempty"`
+	ValBoolSlice    []bool    `otel:"val_bool_slice,omitempty"`
+}
diff --git a/span.go b/span.go
new file mode 100644
index 0000000..3bbc9e9
--- /dev/null
+++ b/span.go
@@ -0,0 +1,49 @@
+package oteltag
+
+import (
+	"reflect"
+	"strings"
+
+	"go.opentelemetry.io/otel/attribute"
+
+	"github.com/remychantenay/otel-tag/internal"
+)
+
+// SpanAttributes takes in a struct and spits out OpenTelemetry span attributes
+// based on the struct tags.
+func SpanAttributes(res any) []attribute.KeyValue {
+	structValue := reflect.ValueOf(res)
+	structType := structValue.Type()
+	fieldCount := structValue.NumField()
+
+	if fieldCount == 0 {
+		return nil
+	}
+
+	attrs := make([]attribute.KeyValue, 0, fieldCount)
+	for i := 0; i < fieldCount; i++ {
+		tag := internal.ExtractTag(structValue, i)
+
+		if len(tag) == 0 || tag == valIgnore {
+			continue
+		}
+
+		var omitEmpty bool
+		before, after, found := strings.Cut(tag, ",")
+		if found {
+			tag = before
+			if after == valOmitEmpty {
+				omitEmpty = true
+			}
+		}
+
+		field, value := structType.Field(i), structValue.Field(i)
+
+		attr, zeroValue := internal.OTelAttribute(field, value, tag)
+		if !zeroValue || !omitEmpty {
+			attrs = append(attrs, attr)
+		}
+	}
+
+	return attrs
+}
diff --git a/span_test.go b/span_test.go
new file mode 100644
index 0000000..f346345
--- /dev/null
+++ b/span_test.go
@@ -0,0 +1,139 @@
+package oteltag_test
+
+import (
+	"context"
+	"testing"
+
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
+	"go.opentelemetry.io/otel/sdk/trace/tracetest"
+	"go.opentelemetry.io/otel/trace"
+
+	oteltag "github.com/remychantenay/otel-tag"
+)
+
+func TestSpanAttributes(t *testing.T) {
+	const testOperationName = "span"
+
+	setupTracer := func() (*tracetest.SpanRecorder, trace.Tracer) {
+		spanRecorder := tracetest.NewSpanRecorder()
+		traceProvider := sdktrace.NewTracerProvider(sdktrace.WithSpanProcessor(spanRecorder))
+		tracer := traceProvider.Tracer("test-tracer")
+
+		return spanRecorder, tracer
+	}
+
+	t.Run("when non-zero values - should add all attributes to span", func(t *testing.T) {
+		const (
+			wantSpanCount          = 1
+			expectedAttributeCount = 12
+		)
+
+		spanRecorder, tracer := setupTracer()
+
+		m := model{
+			ValStr:          "a_string",
+			ValInt:          42,
+			ValInt64:        42000000000,
+			ValFloat32:      3.14,
+			ValFloat64:      99.718281828,
+			ValBool:         true,
+			ValStrSlice:     []string{"a_string_1", "a_string_2", "a_string_3"},
+			ValIntSlice:     []int{1, 2, 3},
+			ValInt64Slice:   []int64{100000, 200000, 300000},
+			ValFloat32Slice: []float32{1.1, 2.2, 3.3},
+			ValFloat64Slice: []float64{4.4, 5.5, 6.6},
+			ValBoolSlice:    []bool{true, false, true, false},
+		}
+
+		func() {
+			_, span := tracer.Start(
+				context.Background(),
+				testOperationName,
+				trace.WithAttributes(oteltag.SpanAttributes(m)...),
+			)
+			defer span.End()
+		}()
+
+		spans := spanRecorder.Ended()
+		if len(spans) != wantSpanCount {
+			t.Errorf("\ngot %d spans\nwant %d", len(spans), wantSpanCount)
+		}
+
+		attrCount := len(spans[0].Attributes())
+		if attrCount != expectedAttributeCount {
+			t.Errorf("\ngot %d attributes\nwant %d", attrCount, expectedAttributeCount)
+		}
+
+		// for i := range spans[0].Attributes() {
+		// 	t.Log(spans[0].Attributes()[i].Value)
+		// }
+	})
+
+	t.Run("when zero values and omitted - should not add attributes to span", func(t *testing.T) {
+		const (
+			wantSpanCount          = 1
+			expectedAttributeCount = 1
+		)
+
+		spanRecorder, tracer := setupTracer()
+
+		m := model{ValBool: true}
+
+		func() {
+			_, span := tracer.Start(
+				context.Background(),
+				testOperationName,
+				trace.WithAttributes(oteltag.SpanAttributes(m)...),
+			)
+			defer span.End()
+		}()
+
+		spans := spanRecorder.Ended()
+		if len(spans) != wantSpanCount {
+			t.Errorf("\ngot %d spans\nwant %d", len(spans), wantSpanCount)
+		}
+
+		attrCount := len(spans[0].Attributes())
+		if attrCount != expectedAttributeCount {
+			t.Errorf("\ngot %d attributes\nwant %d", attrCount, expectedAttributeCount)
+		}
+	})
+
+	t.Run("when zero values and not omitted - should add attributes to span", func(t *testing.T) {
+		const (
+			wantSpanCount          = 1
+			expectedAttributeCount = 1
+		)
+
+		spanRecorder, tracer := setupTracer()
+
+		m := struct {
+			ValStrNotOmitted string `otel:"val_str_not_omitted"`
+		}{
+			ValStrNotOmitted: "",
+		}
+
+		func() {
+			_, span := tracer.Start(
+				context.Background(),
+				testOperationName,
+				trace.WithAttributes(oteltag.SpanAttributes(m)...),
+			)
+			defer span.End()
+		}()
+
+		spans := spanRecorder.Ended()
+		if len(spans) != wantSpanCount {
+			t.Errorf("\ngot %d spans\nwant %d", len(spans), wantSpanCount)
+		}
+
+		attrCount := len(spans[0].Attributes())
+		if attrCount != expectedAttributeCount {
+			t.Errorf("\ngot %d attributes\nwant %d", attrCount, expectedAttributeCount)
+		}
+
+		for i := range spans[0].Attributes() {
+			t.Log(spans[0].Attributes()[i].Key)
+		}
+	})
+}