We all, collectively, seem to have too much stuff. A lot of glitches seem to be spending an inordinate amount of time just sorting their bags. It's the kind of thing that computers are way, way better at.
Here's my recommendation: the ability to set bags so that they are dedicated to certain items, or types of items. A food bag that, when it has spaces, automatically takes food that you pick up. A drink bag. A seed bag. Etc. Like toolboxes, or element bags, or spice boxes, only where you choose to make them pick that item up when you make it.
Alternatively, some kind of automatic sorting mechanism that would organize all of your bags. I'm not sure how would be the best way to do this. (If this is something you can do with the API and someone has programming smarts that would be neat too.)