Watertight: Simple, effective roll-top closure protects from the elements. * Easy Access: QuickClip Closure allows for one-handed access to your stuff. * 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 or add the Backpack Organizer. * Width 4 in / 10 cm, Length 15 in / 38 cm, Height 18 in / 46 cm, Volume 1037 cu. in / 17 liters, Weight 1 lbs 13 oz / 818 g