For folks planning to travel with their hiking, backpacking or trekking pack, the Medium AirCover does double duty as a durable cover with a zip-back closure to fully encase and protect your pack on the bus, train or plane and doubles as a raincover whenSpecs VOLUME: 5492 IN 3 DIMENSIONS: 14.17H X 17.32W X 29.13D IN. WEIGHT: 0.747 LBS. MAIN: bluesignA(R) APPROVED 100% recycled 40D high-tenacity nylon, DWR treatments made without PFAS