Venum Challenger Xtrem Backpack: way more than an oversized backpack. This backpack is a fully convertible equipment bag: transform it from its backpackform to a great duffle bag ans take all your gear with you! The mesh panels provide a great ventilation through the bag, keeping your gear fresh and far from the growth of odor-causing germs while the Ripstop fabric is making this bag one of the most resistant ever. The insulated side cooler pock