Review on 📸 Convenient & Stylish: WOVTE 20-Pack Plastic SD Card Holder Case in Transparent White - Perfect for SD MMC SDHC PRO Duo Memory Cards and Jewelry Storage by Darrell Shreves

They are quite thin but do the job. I would STRONGLY suggest using these with another storage case - I have one that holds 6 cards - so it's no big deal. I've found that most of them stay closed even after being dropped 2 feet onto the countertop. There are a few in the package that will not be. I think you get what you pay for. I also note that unlike some cases, the card isn't hung from the bottom of the case, but lies flat on it. Remember that.