Nylon Spacious, fully padded main compartment Flat top with dual ladder lock buckle closures Drawstring cinch closure Padded base Internal laptop sleeve fits most 15 laptops Technically the best. The Rover Pack Tech is made from tough recycled 1000D nylon with a cinch top closure. An exterior front pocket and top flap pocket give quick access to smaller items and an external padded laptop sleeve holds your computer secure. A large internal sleeve can be used for notebooks, a laptop or other gear. Expandable side pockets hold your water bottle in place.