Our Packing Cubes are built from Challenge TX70 Ultra(TM), an ultralight three-layer laminate. This advanced material combines a 70d recycled polyester ripstop face with 45Adeg Ultra(TM) CrossPly yarns for unmatched stability and tear resistance, all bonded to a 0.25 mil PET waterproof film. At the core are Ultra(TM) fibers, pound for pound stronger than steel, which give the textile near-impossible resistance to rips, tears, and abrasion. Despite this extreme durability, it remains ultralight and weatherproof with a semi-translucent finish that lets light through for quick and easy organization. Compatible with all Mission Workshop backpacks. Each cube features water-resistant YKK Aquaguard zippers for smooth, secure access and a soft, reinforced grab handle for quick retrieval or standalone carry. Lightweight, durable, and weather-resistant, the Ultra Packing Cubes are designed to keep your essentials organized and protected in any environment.