I too would like to see color-able bags. We could even have them marked with little symbols so you know that is my arrow bag or allow for renaming of a bag.
Your idea of filtering items into bags would make inventory management less time consuming. I hope whatever features they use will make it faster to sort and find items. A search filter would be nice to add along with their standard tabular item sorting feature that way when you only look at armor but have loads of it in a bag you can filter to heavy or medium or a rarity. That would be something to think about adding as well. (sort of like the search bar in Path of Exile...made finding items quick when sorting through many many tabs of stuff)
