Could also just add the feature to make folders in your inventory, still counting the whole as 1 inventory but with subfolders ---> then i have a subfolder binders with binder 1 23 and boxes 1 2 3 and so on... pretty simple.... no need to have tags on a card (that takes a lot mor time when entering the cards....) just add them to a folder of your inventory and if changed switch folder, for cards in decks you have a folder "in deck" and add it to a decklist....
this is the only thing i miss here and the point why im looking for something else before i put a lot of work into this, unless there is fast response to this post
I like this idea so long as when I'm viewing an inventory at a specific level I am viewing the entire inventory from that point and below.
So I can go to the top level and view ALL my cards and search for something specific and see which inventory it's in.
If I'm looking for something in my junk boxes I can navigate down to junk boxes folder and view just the cards in all the various junk boxes, search for a card and see which specific inventory or box it's actually located in.
My initial thought was you could even have multiple top level inventories for like a trade inventory and a non-trade inventory but really you could just separate that out at the second level. This is really flexible.
Next idea building on this would creating a way to alter the visibility of the various inventories like you can password protect your inventory now. So I could make my trade folder publicly visible but my non-trade folder password protected.