heavy duty oversized wheels with extra clearanceiFOM material (integrated foam)construction throughout for added gear protectionlarge main compartment with adjustable dividers and padded helmet chambersecure hold compression strap systemseveral multi-use LID compartments for apparel and smaller gearSLED (Structural Load Equalizing Deck) system for increased durability and handling in the harshest of conditionstelescoping pull handlewide mouth LID opening for easy access to all gear compartments