This is a 50L, waterproof, hiking backpack. Dimension: 12.60’’x 8.66’’x 20.87’’. There are 8 adjustable straps that can be used to fit anyone of any size and height. It features an adjustable sternum and waist strap. The back has comfort mesh panels and the shoulder straps are reinforced. The entire bag is made from a combination of water-resistant nylon, which makes it durable and highly weather-resistant. There are several compartments to store anything you might need for a 2 - 4 day excursion. There's a shoe department to keep shoes away from other things, a front compartment for cell phone or other small electronic devices, and a drawstring pocket on the side for things like a water bottle. Each zipper comes with an extra durable strap for easy find and easy grip. My son uses this backpack for his job and he loves it. He carries all of his work supplies and everything is within easy reach. This is superior backpack for any use.