This fits your .
1.Protect your backpack from rain. 2.Adjustable drawstring and cord lock closure. 3.Durable, foldable, lightweight and wear-resisting. 4.With elastic design, it is able to adjust the size according to different backpack. 5.Lightweight and easily stowable waterproof rain cover.
KLOUD CityBlack nylon backpack rain cover for hiking / camping / traveling (Size: M) - B00CENWGVC