The transition backpack is fabricated from durable, 600 denier Polyester/PVC, and provides more features than any bag in its class. Features include padded adjustable back straps, 2 large internal mesh shoe pockets, removable waterproof bag for wet items (with clip for wetsuit), dual zip fully openable main compartment, large outside mesh pocket, exernal helmet pocket with safety clip and bungee straps, 2 external mesh water bottle pockets, 5" expandable mesh bottom compartment for a wetsuit or towel, 2 paded side pockets for cd player w/slit for headphone wire, and relflective binding on padded straps, side pockets and front face of bag.