Platypus DuoLock Collapsible 1 Liter Water Bottle - Big Blue Horn - The Platypus DuoLock SoftBottle Collapsible Water Bottle is a flexible and lightweight water bottle for hiking, camping, and backpacking adventures. The DuoLock design doubles the protection as the double-locking cap won't accidentally twist or twist, preventing leakage. The clip-on door handle makes it easy to carry or attach to a strap or loop. Collapsible bottle flattens and rolls when empty, saving space. The materials are flavor free, BPA free, and phthalate free. The wide-mouth opening makes filling and cleaning easy, and the bottle's ergonomic shape makes it easy to grip, pour and drink.