Description: Specially reinforced, keep your backpack and belongings dry from rain, mud and dust. Reflective Film ,Seamless construction for weather-tight protection. With elastic design, it is able to adjust the size according to different backpacks. Compact and Portable: It can be easily folded so that you can put it in the side bag of your backpack for storage. Perfect for school bag, backpack, daypack, rucksack for outdoor travel, riding, climbing, hiking, cycling, commuting. Specification: Made of polyester features wear-resisting and durable. Size Chart: S(18-25L):Height:30-40cm/11.81-15.75inch,Length:20-32cm/7.87-12.60inch,Width:15-20cm/5.91-7.87inch M(26-40L) :Height:40-53cm/15.75-20.87inch,Length:20-32cm/7.87-12.60inch,Width:15-20cm/5.91-7.87inch L(41-55L) :Height:53-65cm/20.87-25.59inch,Length:20-35cm/7.87-13.78inch,Width:19-23cm/7.48-9.06inch XL(56-70L) :Height:70-75cm/27.56-29.53inch,Length:20-35cm/7.87-13.78inch,Width:20-23cm/7.87-9.06inch Package Includes: 1 x Waterproof Backpack Rain Cover