Waterproof is elementary to backpack cover Backpack is not only a umbrella for backpack, it's also a signal and protector. When student use it or when you are travelling at some crowded places it could protect your belongings from being stolen or lost. And if you like traveling or taking outdoor activities, it's easy to be found by others& distinguish from others. Durable construction A-SAFETY backpack cover features are collapsible, lightweight and durable. The main material of A-SAFETY backpack cover is 210D waterproof Oxford fabric& 3M scotchlite reflective stripes, it's compressed by 3 kinds of fabrics. Each of their function is different, outer fabric is waterproof and inner fabric is to enhance the structure of cover. Even the backpack cover consists of 3 kinds of fabrics, but the thickness is ultrathin. Effectively protecting your backpack and belongings from rain, water, snow, dirt and sand. Backpack cover features snowproof and not freeze in the snow. The fabric still remain flexible and perfect fitted. There's a very useful Mesh Bag for storage & carrying, it makes more convenient for you to put small things, such as mineral water, pens or some tools for you easy using at any time. Style& capacity Two colors (Lime-yellow, Orang) for backpack 20-45L. The possibilities are endless. We hope you find it as useful as we do! Your satisfaction is 100% guaranteed with this product. Features & details A-SAFETY Effectively protecting your backpack , high reflective waterproof backpack rain cover Ideal for any rainy activities. Backpack is not only a umbrella for backpack, it's also a signal and protector. When student use it, it could protect your belongings from being stolen or lost. And if you like traveling or taking outdoor activities, it's easy to be found by others. FEATURES High visibility, collapsible& lightweight, waterproof, wear-resisting, durable,made of high quality 210D waterproof Oxford fabric & highly reflective stripes. VERSATILE&EASY TO USE Elastic band and adjustable tightening string to fit more backpack sizes. Suitable for rainy days night outdoor activities, such as camping, hiking, traveling, etc. External fabric is rip-resistant that protecting backpack from scratch, dirt, sand and internal is waterproof coating that keep it from water, rain, fog, snow, dirt and sand.