The 13 litre medium weight drybag from ortlieb is a premium quality drybag that has a proven roll closure and single stiffener bar to ensure 100 waterproofness and the design of the bag offers maximum packing volume this medium weight drybag has a reinforced base for increased stability and an easy to clean inside making it ideal for a wide range of uses to keep your kit dry ortlieb drybags are incredibly well made reliable durable and of course waterproof they are manufactured using the highest