For folks planning to travel with their hiking, backpacking or trekking pack, the 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 when you hit the trail. Comes in two sizes to fit most packs. Features Packs into itself Includes draw cord to adjust fit Zips closed to protect pack when checked Works with pack straps for rain protection Medium fits packs 45-75 liters in volume. Large fits packs 70-110 liters in volume. Medium: VOLUME: 5492 IN 3 / 90 LMedium: DIMENSIONS: 74H X 44W X 36D CMLarge: VOLUME: 7079 IN 3 / 116 LLarge: DIMENSIONS:80H x 48W x 42D CM   Fabric bluesign® approved 100% recycled 40D high-tenacity nylon, DWR treatments made without PFAS Osprey AirCover Secure Backpack Travel Cover, Duffle Bag and Raincover