I use empty tins to store top loader cards! And use the window to make a note of what kinds of cards are stored. This way, I don't have to buy a separate top loader binder just to risk getting pages and cards bent from flipping pages too much. It also protects the cards from dirt & dust!
Check out this video to see what I mean (fast forward to 3:03)
Check out this video to see what I mean (fast forward to 3:03)