Exped Camp & Hike Tempest Duffle 140L Black 7640147769007. The TPU film laminated 840-D and 420-D fabrics are welded for lasting waterproof performance and the 100percent waterproof YKK FlexSeal zipper ensures dry storage of contents. Refined to the max: carry straps double as backpack style shoulder straps and the overall design features the bare necessities for an excellent weight to volume ratio. The high frequency welded construction warrants durability.