JanSport Flex Pack Backpack Properties: 100% recycled polyester 600 denier One large main compartment Side water bottle pocket 15-inch laptop case Bungee cord attachment system for overstock management Front utility pocket with organizer Fully padded back panel;JanSport Flex Pack Backpack Properties: 100% recycled polyester 600 denier One large main compartment Side water bottle pocket 15-inch laptop case Bungee cord attachment system for overstock management Front utility pocket with organizer Fully padded back panel