I've split requests into three categories, depending on how much they suggest to change.
No sack request.
- Onions, leeks, cabbage lettuce can stack to 60 vs 35
- Brains and bollock can go into "trash" stockpile
Minimal sack
- Sack can hold at least 60 of each produce (tubers, onions, etc.)
- Sack can hold items you can't stockpile otherwise (meat, brains, bollock, opium pods)
Wholesack
- !! There are now two sacks: small and large produce sack
- Small sack requires 4 cloth and a rope, maybe no bone glue - early game saver!
> Small sack holds a stockpile of produce (excluding large stockpile such as soil, sand, snow, pumpkin, hay, metal, etc., or limiting it to 35-60 items)
> Small sack can be stacked 3 high. Bottom of the stack must be full. You can directly access only the top sack. - Large sack take 8 cloth, 2 rope and 2 bone glue
> Large sack can hold 90 items (increasing stockpile size for produce, bones, stone, etc.) or full "large" stockpile.
> though metal bars are still only 35 ct. a large sack/stockpile. Larger piles are transported in chests etc.
> Large sack isn't stackable, and carried at a crawl speed - Both sacks can accept some non-stockpile items (meat, brains, bollock, maybe small animal corpses like chicken/rabbit/squirrel/adder) stacking up to 60/90 ct (or 35/60 ct. for animal corpses)
P.S. Sack Graphics - love the varmat support. I suggest adding a small "patch" to a sack which could be the secondary cloth color
and striped or back/front fonstruction for the large sack!