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. 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.