Review on [2-Pack] Stick-On Wallet Card Holder, MONCA Flap Ultra-Slim Credit Card Wallet Stretchy Lycra with Secure Flap [Universal] Compatible with Most Cell Phones & Cases (Black+Grey) by Anthony Bandzz

It holds up well after a few weeks. I attached it to the back of the polycarbonate case and the adhesive is really strong. I keep my driver's license, a debit card and two business cards in it. The material is stretchy, like an Under Armor shirt or something. The valve is the most important part that keeps everything safe. Without it, I wouldn't trust the material alone with my cards. I would like the material to be a bit denser, but then again I don't keep much in it so if I had 4-5 cards it would probably fit better. The convenience of not having to carry a wallet with me far exceeds the amount I paid for it. So if something goes wrong I'll probably buy another one.