Please read the size chart before purchase. If you meet the size or any other problems, please simply e-mail us the problem at any time, and we’ll take care of you. Durable for Frequent Use: The backpack rain cover is wear and tear resistant. The buckles on the straps are constructed with strong material for long term use. Design a reflective logo for nighttime safety. Ideal for travel hiking camping cycling and even on the way home. ?Packs into Its Own Mini Carry Pouch?Unigear backpack cover is ultraportable, tiny and saving space. Designed with double-sided zipper, it can be packed down into its own nylon pouch which attached to the pack cover. Don’t worry about losing the carry pouch again. ?Adjustable to Cover Your Backpack?Unigear rain cover features 2 vertical anti-slip buckle straps to adjust different backpack and pull the pack cover tight across the pack harness. Reinforce the elastic rim around your backpack to prevent sliding off. Comes in 5 sizes and colors to fit from 10L to 90L backpack. ?Waterproof & Rainproof?The Unigear backpack rain cover is 5000mm Waterproof Rating, rainproof under moderate to heavy rain. Made of 70D and 210T Nylon, it causes the rain to bead up and run off the surface instead of soaking in backpack. Even if the water comes in the pack cover accidentally, the small metal hole on the bottom can help to flow quickly.