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 10 in / 25 cm, Length 14.5 in / 35.5 cm, Height 21 in / 53 cm, Volume 2000 cu. in / 33 liters