What about the leather version of the original all nylon version? According to Amazon's descriptions (if it's correct), the leather version is actually slightly smaller.

Allett Original Wallet, Onyx Black | Leather
https://www.amazon.com/Allett-Original-Minimalist-Blocking-Receipts/dp/B0931V3PWV/
5" x 3.9" x 0.25" (127 x 99 x 6 mm)

Allett Original Wallet | Nylon
https://www.amazon.com/Allett-Original-Wallet-Black-Blocking/dp/B0987YC2CJ/
4" x 5.1" x 0.25" (102 x 130 x 6mm)