The ortlieb velo shopper is a waterproof 18l stable shopping bag the magnetic fidlock ensures easy opening and closing and the handy ql2 system ensures quick fixing and removing to and from the rack the padded internal stiffener ensures stability which is very convenient especially when the bag is filled with groceries the abrasion and tear resistant ps 42rps 33 cordura fabric is 100 waterproof and super lightweight base and rear are reinforced by extra strong fabric further features z