Describe the feature you'd like to have added

I think it'd be cool if the card filters could be stored in the card holder. although they stack regardless, if you have 1 of each filter in your inventory, that's 4+ slots being used in your crammed inventory. Plus, whenever you'd use a filter, the card holder menu is already right there.

Additional information

Loving the mod so far, can't wait for all the card types to be complete!

I really don't want to add the cardholder UI to the card UI - its already complex enough, sorry!