Assecure 18 game card case for Nintendo 3DS, ̗̀new ̖́- 3DS XL, 2DS & DS - 18 in 1 game cartridge folio style plastic storage case travel box - Yellow & black

I have a few of these, their are similar ones you can get on like amazon. I know it it only 18 but they stack nicely and when no in use can go in the same shelve as the game cases.