Take a load off with Ortlieb's lightweight AirFlex 11 pack. It's made from tear and abrasion resistant nylon with a roll top closure for a completely waterproof rucksack. A Flex-Wire harness system with foam padding, wide waist belt, and a chest strap keep the bag secure while raised back pads facilitate ventilation. Inside a hydration system (sold separately) can be integrated into the pack without compromising the waterproof features and a removable inner pocket helps organize things. Two neoprene outer pockets and compression cords hold items outside the bag and reflective accents with a specific light attachment point increases visibility.