Beis the Expandable Backpack in Black. TROLLEY PASS-THROUGH LAPTOP FRIENDLY WATER BOTTLE POCKET Hidden water bottle pocket with zipper closure, water bottle pocket can be used from the inside too. KEY LEASH Never lose your keys again thanks to our built-in keychain. Dims: W 13" x H 15" x D 5-7" handle drop : 3.54in Backpack strap at longest : 33.46in at shortest : 19.68in