https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1507020294

This mod adds lots of different categorical bags to help with inventory management.

This includes one for 'quest items'

I love the fact that it has an 'auto-bag' book, which would automatically store all your 'loose' inventory into the appropriate bag. I've slotted this into my action bar so that i can quickly store gathered items, making inventory management a breeze.

Also includes a 'quick-sell' bag, which you can drag unwanted items into, and quickly sells them on the go, rather than having to make your way to an NPC.

Messy inventories drive me mad, this mod saved me from plenty of headaches.... props to the mod creator, legend.

(NOTE: This is a Definitive Edition mod, I think a vanilla version is available, though you'd have to check)

hope that helps,

happy adventuring