As we all know double XP is coming up and with it we are basically forced to go to Wikipedia to see if the item we have in the bank will apply the double XP... So my suggestion is give the players a way to identify what item will not have a double XP multiplier and which ones will.
This can simply be done by adding a button (bonus experience identifier button)
When pressed the items that will have double XP will be outlined in green and the ones who won't be affected by double experience will be outlined in red .
We can break it down further the first time you press the button the game will display the items that will be normally affected by bonus XP that you would normally get from treasure hunter. (Items effected by regular bonus XP.)
The second time you press it, it will display the items that are and aren't affected by double XP. (Double XP weekends.)