This Mini Slab Case Backpack is for the card show attendee or someone wanting to transport the more important parts of their collection close to them. It holds roughly 15-20 graded cards including PSA, BGS, SGC, CSG, HGA etc. It has a shoulder strap for easy carrying. Form fitting foam on the inside with a lid if you need to cover anything. Includes a USB port to plug in a power bank and multiple storage pockets for any other accessories needed for the trip.