Pillow and pillowcase volumes are mismatched... again.

[Aerin-of-the-Toast]

Is your feature request related to a problem? Please describe.

Part 2 of an issue I made three years ago, #48606 . Back then, pillows were 1L in size but a pillowcase was 15L. That issue was fixed in #77801 when Night-Pryanik set the volumes to 40L and 42L which at least causes them to be closely matched. But since 40L was deemed too large for a pillow when compacted, #77890 lowered the volume of pillows to 9L. Now we're back to a mismatch where you can somehow squeeze 4 and 2/3rds pillows inside a pillowcase. At least it's not as extreme as 15 pillows.

Solution you would like.

There was a LOT of discussion in #77890 about the volume of a pillow, mostly around rolling up or 'compressing' the pillow and a lot of mathy math about sizes. I don't quite want to rehash all that, and honestly just picturing it in my head, 9L for a normal bed pillow seems a lot more reasonable than 40L. Converting that to imperial because my American brain can't intuitively comprehend liters, that's over 11 gallons, or about 7/10ths of a beer keg (thanks Google).

Assuming 9L is the more reasonable size, then the pillowcase should probably be reduced to match to roughly 10L. Or I guess about 3 gallons, which is roughly the size of a 3-gallon jug.

Describe alternatives you have considered.

It's very possible my spatial logic is wrong and pillowcases really can hold 42L, and therefor pillows should be 40L, I'm not certain either way. Or maybe someone can prove this whole issue moot by squeezing 4 pillows into a pillowcase with room to spare, but honestly half the time I have a hard time squeezing one pillow in.

Additional context

I got no clue regarding dakimakura, but we don't even have covers for those yet anyway.

[GuardianDll]

Just measure how much of stuff, different from pillows, a single pillow case can hold. I think it's as simple as "pillow case should be able to hold the size of uncompressed pillow"

Or maybe someone can prove this whole issue moot by squeezing 4 pillows into a pillowcase with room to spare, but honestly half the time I have a hard time squeezing one pillow in.

As part of actual experiment, i picked my 20L pillow case with pillow, and put another pillow inside, confirming that there is some compression in it. I was not able to fit more than one additional pillow in the pillow case tho (i have no more pillows)