The PS10 Dry Bag from Ortlieb is ideal for when you need to pack as efficiently as possible. The dry bag is made from 100% waterproof nylon. The bag has a unique roll closure, which makes it easy to minimise the volume of the bag as much as possible. This can be further enhanced by using the valve on the side to compress the bag even more. Furthermore, the bag is also completely watertight at the top after 6 twists. Furthermore, the bag has a reinforced bottom and is made with extra durable PS21 fabric, so the bag is durable and can take a bit of a beating.