Fabric: Water-resistant Polyester. YKK Zipper and YKK Buckle Includes an adjustable hip belt on this bag that fits waist sizes 29–53 inches,but the belly strap is not removable.An adjustable sternum strap, breathable molded foam back panel, and S-shaped shoulder straps ensure you can properly carry the weight of your gear. Two-day packs:For a pack you’ll take camping over a weekend, a capacity of 40 to 65 liters is common. These mid-size packs work for carrying a small tent, along with other gear you’ll need for a couple of nights. You can fit some cool weather gear in a pack of this size, but for a lot of winter gear, you’ll probably need a larger pack. Separate bladder sleeve in the main compartment.Big enough for a 3 liters hydration bladder or a 17"laptop. There is a waterproof cover in its own zippered compartment at the bottom of the pack. It covers the entire backpack