Watertight Construction: Convertible roll-top opening can be inverted out of the way for easy access. * Burly fabrics: RF-welded, PVC-free 600D PU-coated polyester body and scrim-reinforced urethane detailing. * Add-on Accessories: Easily attach Mobile Electronic Cases or Zip Pockets to the external M.A.P. System * Dual-Purpose Straps: Carries like a grocery bag or backpack?whatever works for you. * Width 4 in / 10 cm, Length 15 in / 38 cm, Height 18 in / 46 cm, Volume 1000 cu. in / 16 liters, Weight 11.4 oz / 354 g