Altura39s dryline39s are made with a durable two layer construction which creates a waterproof layer inside a tough cordura outer the two layers help them to keep their shape they are also lightly padded and have rubber feet that add to the bags stability and durability outside they feature reflective logos and piping mounting is courtesy of rixen and kaul39s clip system which is adjustable and easy to use with inserts available for different diameter racks