ID card folder

thingiverse

This is a super handy ID/train card folder that you can snap right onto your bag and take off just as easily. It's an absolute lifesaver when you need to whip out your card in a flash! Plus, you can customize its thickness to fit your taste - choose from any belt width or card size you like. When you're ready to print one, be sure to do it the right way: vertical orientation with the opening facing up.