Cloudburst is a lightweight, compact-when-stowed, waterproof roll-top pack for day hiking in all weather, keeping gear dry and sand-free at the beach, and as a multi-use day pack for all kinds of adventure travel. At 9 ounces the Cloudburst 15 is light enough to be carried as waterproof stuff sacks for clothing or a sleeping bag, and then used for day outings from a camp, yurt, hut or B&B. In this way, these packs have a net weight of zero, since they replace a waterproof stuff sack and do double duty as a pack.