The clear choice for four seasons sports when weight ,ventilation, and ruggedness is a priority. Equipped with a perforated and breathable back plate and shoulder straps made out of high density foam. The back plate harness is dressed with strong nylon mesh and is waterproof. Polyester fabric for the interior (triple coated Polyurethane as water seal) protects from the heaviest water exposure. The interior features larger mesh pockets for your bike tools or the power lunch. The pocket divider can be removed for easy cleaning and once inserted creates a sleeve pocket for your laptop or maps. Overall the Meg Sport is prepared to handle all the available Megalopolis accessories to customize for biking, skiing, or expanded packing capacity. Like other Megalopolis models the Meg Sport also comes with standard phone pocket, standard waist belt and cargo strap. The patented impact protective shell is for the Meg Sport diamond polished plastic. Beat it up and it will just look better over time.