PickPocket Slim Wallet

Pickpocket measures 87.6mm wide, 56mm tall, and 9.2mm thick.  It can hold cards, cash, and even guitar picks!

It is held together with a single elastic band that is looped around bars so that it is secured purely by friction and requires no sewing.  To fasten each side, loop the band under two of the bars, through the middle gap, and then under the first bar.  The friction may not hold the elastic while only one sided is in, yet once both sides are in, it should hold.  Simply pull on either end to adjust the tension of the band.

This wallet can hold almost any number of cards.  If you had a long enough elastic band it could probably hold up to 100 cards!  The elastic measures 20mm wide and 2mm thick.  The length is dependent on how much stuff you put inside; I cut mine at a little over 220mm and carefully melted the ends with a lighter so that they don't fray.

I printed both parts inside-side down on an Ender 3 with Hatchbox PLA at a 0.2mm layer height.  The only possibly hard part of it to print would be the small bridge sections that hold the elastic.

I've had mine in my pocket during work and other activities, and I haven't had it come apart on me at all.