Columbia PFG Perfect Cast Waterproof Roll Top Daypack Constructed from water resistant 420D Nylon with welded seams Large main compartment with roll-top closure and securing lashing strap Contoured shoulder straps with high-density foam and breathable air mesh Side compression straps SMALL - Dimensions: 24.6 in x 13.5 in x 6.3 in, Storage Capacity: 40.4 L (2466 cu. in), Weight: 2 lbs, Lifetime Warranty LARGE - Dimensions: 28. 9 in x 13.5 in x 7.3 in, Storage Capacity: 55 L (3356 cu. in), Weight: 2.6 lbs, Lifetime Warranty