The heaviest-duty dry backpack we make, 30L of premium dry functionality. Assembled with 2100 ripstop double-sided PU lightweight fabric with full welded seams. Not a drop will get in. The design includes an easy access zip close exterior, laptop compartment with a removable water-resistant roll-top padded laptop bag. This extreme backpack also features a Vissla's Air Crossover padded back to keep moisture away from your back. Safari-ready.