Ortlieb - Large Packsack The Ortlieb PD350 is a roll-closure dry bag engineered for robust protection of gear against water and dust. It features a heavy-duty, abrasion-resistant polyester fabric construction. The closure system incorporates a stiffened strip and buckle at the top to ensure a watertight seal when rolled down. It is equipped with a D-ring at the base for securing the bag in place or for lashing down equipment. Designed for versatile use in varied environments, the bag includes a reinforced bottom for increased durability and stability when standing upright.