Someone suggested this in global chat, and it seems didn't make a thread. Having bags either specific to certain item types, or that we can choose to allow to hold only certain item types (or those item types have preference towards) would be nice. An example would be I have a bigger bag I like to keep food in it, I tick 'Food' and now any new food I get goes there instead of the leftmost empty slot/bag.
I would also just settle for 'If X item is found in Y bag, put new stacks of X item in Y bag'.