UPGRADED BUCKLE STRAP :Our backpack rain cover comes with Elastic and Anti-Slip Cross Buckle Straps for maximum stability.Even during Motorcycle Travel, the backpack cover will not slip off. HIGH-LEVEL WATERPROOF:Our waterproof backpack cover is made of 210t mixed material.With an inner layer cover boasting a PU coating, it offers a reliable rain resistance of up to 8000mm. MULTI LAYER CONSTRUCTION: External fabric of backpack rain cover is rip-resistant that protecting backpack from scratch, dirt, sand and internal is double waterproof coated layers that keeping off water, rain, fog and snow.Suitable for backpacks ranging from 15-90L, refer to the size chart in the 6th picture or description for the perfect fit. COMPACT and PORTABLE: Our backpack rain cover Weighing only 2.2~4.4 ounces (Size: S~XXL, won't weigh you down on your adventures. Comes with a convenient rainproof storage pouch, allowing you to fold and store it easily when not in use. Hassle-Free Exchange: FREE exchange size when backpack rain cover not match without RETURNING, FREE exchange when waterproof backpack cover get ripped.Additionally, our backpack cover is backed by a worry-free 36-month warranty. WSZCML Backpack Rain Cover is ideal for hiking, camping, traveling, cycling, hunting. Protect your backpack from dust, scratch, rain, and snow. Suitable for Hiking Backpack, Travel Backpack, Camping Bag, Camera Bag, Internal Frame Backpack under 90L. Also perfect for Bookbag and College Backpack, keeps your laptop and books dry and clean! Professional Grade Features: ✔ 4 Layer Waterproof Technology: 100% WATERPROOF - Made of high-quality Tear Resistant Compound Material, external waterproof coating, Inner layer cover with PU coating offers reliable protection of up to 8000 mm of rain resistance, Ideal for any rainy activities. ✔ ULTIMATE ALL-OVER PROTECTION: The Elastic and Cross Buckle Straps provided extra stability and 50% more coverage, make sure your backpack get fully covered, protect your backpack even in heavy wind. ✔ ULTIMATE HANDY: Weighing only 2.2~4.3 ounces(Size: S~XXL), Each backpack cover comes with a RAINPROOF STORAGE POUCH that you can just clip it to your backpack, you will never be unprepared for the sudden rain shower. ✔ Made of 210T Compound Material features WEAR-RESISTING and DURABLE. Available in 5 sizes (for backpack from 15L - 90L) and multicolor for the perfect look and fit. Size Chart: S:10-25L (Height:13.4-15.4in Length:9.8-11in Width:5.9-7.1in) M:25-35L (Height:17.8-20.5in Length:11-14.6in Width:5.9-7.1in) L: 35-50L (Height:20.5-23.6in Length:12.6-14.6in Width:7.1-8.7in) XL:50-65L (Height:23.6-27.6in Length:12.6-14.6in Width:7.1-9.5in) XXL:65-90L (Height:26.4-30.3in Length:14.6-16.6in Width:9.1-10.6in) (If you are planning on stowing things on the outside of your pack, We would recommend getting a size up so that it will easily cover your entire pack.)