Describe the feature

I would really love it if BetterBags would allow me to set up tab affinities, like the ones Blizz has added, but expanded. For example:

• this tab is for leatherworking reagents, current expansion
• this tab is for alchemy reagents current expansion
• this third tab is for all other reagents

Describe the implementation

There are a ton of ways this could be implemented. Perhaps the most sensible way would be to assign betterbag categories and subcategories (plus the ones Blizzard has added, like expansion) to specific tabs. You could r-click the tab, select the various subcategories you want deposited there.