Baud Bag is a pretty neat mod that lets me "combine" my bags arbitrarily into larger bags. For example, I can make one bag out of two of my bags, and another from the remaining three.
I'd want this exact thing, except instead of the granularity being at the bag level, it'd be at the slot level. For example, I might want 3 bags, but one of them has 5 slots, another with 8, and "the rest" in a big pile. It'd be perfectly acceptable for there to be a free slot in 5 slot bag, and 2 free slots in the 8 slot bag.
There is a common theme with bag mods that they assume you either want one big bag, or you want lots of auto-filtered small bags. I can only imagine there are people like me who want manually filtered small bags of arbitrary sizes to satisfy our OCD. Thoughts?