This Columbia Perfect Cast PFG Small Waterproof Roll Top Daypack is constructed from water resistant Nylon with welded seams. The main compartment has a roll top for easy closure, securing lashing strap to keep everything inside and side compression straps. The shoulder straps are contoured high-density foam and breathable mesh for the most comfort. The sternum strap is removable for versatility. The dimensions are 25"x14"x6" with a capacity of 40.4L. Weighing only 2 lbs and featuring a lifetime warranty, this innovative product will make you want to go outdoors and stay there.