This Slab Case Back Pack is for the card show attendee. It holds roughly 40-50 graded cards including PSA, BGS, SGC, CSG, HGA etc. It has 2 straps for easy carrying and a buckle for across the chest to help support the weight. Includes a Slab Case 2GO inside the case. Includes a USB port to plug in a power bank and multiple storage pockets for any other accessories needed for the trip including a laptop.