Michael G. Bluth is an active duty sailor in the US Navy who started Open Sea Leather (or if you go by the name of his Etsy shop, Das Offene Meer Leather) as a side gig in 2015. One of his more popular products is the Topsider, a wallet handmade from a single piece of full-grain Buttero leather.

Here's how he describes its functionality:

[The Topsider] features a unique tuck closure and 2 pockets fitting up to 10 credit cards and quite a bit of cash. We have fit as many as 25 bills and 6 credit cards in the wallet at one time. The main benefit of the Topsider is the ability to store cash without folding it first. Simply slide it in the back and tuck it in the front along with the flap.

This is a beautifully crafted wallet that feels exquisite in the hand, and at 4" tall by 3.25" when closed, it fits in your pocket nicely. Get it in a variety of colorways for $59 at Open Sea Leather or for the same price on Etsy.