Automatically add all items to blacklist, default to falseSuggestion
The idea is as follows. 

All items are listed in their specified categories. From there, you can set every item to be included or excluded from the backpack list. ( meaning that it won't fit ) 
To make it simple, all new items get automatically added and set on "false" to not have it added in the Backpack. The server owner can then choose if he or she wants to have that item listed or not. 

The possible options to exclude can even be more simple. If you won't like to have a certain category in the backpack, for example, the "fun" category, you can exclude the whole section with just "false".
this would be awesome as I am about to manually type every item/catagory but searching if someone has something i could copy/paste first lol