Venum "Challenger Xtreme Backpack Duffle zip pleat allows the bag to be converted from a backpack to a duffle bag Insulated side cooler pocket Upper micro-fleece pocket to prevent scratches on your mobile phone Duffle zip pleat allows the bag to be converted from a backpack to a duffle bag Hidden MP3 player pocket with Headphone opening Insulated side cooler pocket Upper micro-fleece pocket to prevent scratches on your mobile phone