The Concept X Dry Rucksack is an extreme robust waterproof Rucksack because of its special fabrics. The welded seams makes the bag waterproof. The Rucksack 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. To find small things inside the Rucksack fast and easily, an extra inside compartment is existing.