Card Holder Protector Sleeves, 20 PCS Plastic Credit Card Sleeves Holder Clear Waterproof Soft ID Business Card Holder for Social Security Card Driver's License Insurance Card

These are great fir keeping cards separate

Absolute fantastic product and extremely surprised at how great my cards fitted the wallets without adjusting them. Could not recommend them enough

The material these are made of is very thin, soft and crinkly. It does flatten out when a card is inserted, so this might be by design but it's not what I was expecting.