Newest trent Portable Waterproof Dustproof Backpack Cover Keep Your Backpack and Belongings Dry From Rain, Mud and Dust From Outdoor Activities - 5 size and 8 color available Capacity: 35L/45L/60L/70L/80L Material: Waterproof Nylon Oxford fabric Perfect for outdoor travel, riding, climbing, hiking and so on. Elastic design is able to adjust the size according to different backpacks Specially reinforced, keep your backpack and belongings dry from rain, mud and dust.