The ortlieb dry bag pd 350 is a sturdy strong dry bag that features a roll top closure for that water tight bag typical characteristics of ortlieb dry bags are the smart and simple roll closure and the 3d welding seams which are even stronger than the fabric itself the numerous different versions from small lightweight models to huge xl sizes offer many choices for different uses you will certainly find the right model for your field of application the pd 350 dry bags are a budget version f