CASEMATIX graded sports cards holder features a hard shell plastic exterior that prevents your valuable trading cards from being crushed. The CASEMATIX crushproof trading card case holds up to 5 graded card slabs. The card storage box interior has a soft padded foam top and bottom to securely keep cards in place and prevent scratches on your PSA card cases or PSA card holders. This case features a waterproof o-ring seal that locks out air and moisture for a truly protective playing card carrying case. An integrated pressure release valve allows for air release when changing altitudes.The compact and discreet design of this graded sports cards storage box is ideal for traveling with your valuable sports graded cards. The exterior measures 7.0 x 4.5 x 2.0 inches so it conveniently fits in backpack or luggage. Interior measures 6.25 x 3.5 inches with foam to fit a variety of sports trading cards and fits 5 PSA graded cards or 3 BGS graded cards Works for card sleeves including PSA BGS SGC one touch top loaders and more.