Item: Produce Sack.
Space: 1w by 2h.
Internal Space: 3x3
Stores produce (all manner of harvested vegetable, fruit, etc). Each sack behaves like a seedbag in that a single sack can carry only one type of produce (if apples are in there, only more apples can go in, etc). If harvesting onions for example, they go in there. Carrots, in there. Collecting apples from tree with this in inventory, in there.
Wouldn't fit a pumpkin, but pumpkins are extraordinary in this world.
An useful "seedbag" for the non-seed harvestables - good to store these in storage to take up less room.
Requires: 2 leather, 4 string (or 2 linen 4 string) or something of a similar production. Or 2 leather 1 rope/2 linen 1 rope... - I would actually favor linen over leather as it's harder to obtain and actually makes sense considering what most produce sacks are made of.
Clothmaking or leatherworking
Would be even better when more types of vegetable and fruit are added, I envision cabbage, lettuce, green beans (by the handful I'm guessing), potatoes (roots ftw), etc.