QueenTek Waterproof Backpack Rain Cover for Hiking Camping Traveling Backpack 35L 45L 60L 70L 80L Seamless construction for weather-tight protection Capacity: 35L,45L,60L,70L,80L With elastic design, it is able to adjust the size according to different backpacks. Can be free folded in the sachet, it is portable convenient and ultra-light weight. Perfect for outdoor, travel, riding, climbing