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. Medium fits packs 40-60 litres in volume. Large fits packs 60-75 litres in volume. All of our accessories have been overhauled to offer better organisation, operation, comfort and reduced environmental impact Stores in itself Unit Dimensions: 12L x 8W x 3H