The Pat Love waterproof backpack is robust and waterproof because of it's special fabrics. The welded seams makes the bag waterproof. The backpack is perfect for all water sports and outdoor activities. The rollable locker makes the Rucksack waterproof. Just roll it triple times and the bag is now waterproof. For a fast and easy locking just make a single fold of the bag and fix it on both sides.