Here we have a pretty streamlined no-Frill low-drag Kydex Wallet from CSW Holsters (https://www.etsy.com/listing/221457921/kydex-wallet-tactical-card-holder-carbon?ref=shop_home_active_1).
I put about 7 credit cards in there and a couple bills folded up and it held it without falling out. I dropped the wallet from a height of 12 feet high with 2 cards in it and than added a couple more each time and nothing fell out when it hit the ground. Everything was secure. Pretty solid wallet with a bunch of awesome colors to boot. We have the Black carbon fiber style. Also it has three lanyard holes so you could secure it like a biker wallet if you wanted. Overall a really great piece of kit. Thank you CWS Holsters.