BlueField All-Weather Ripstop Backpack Rain Cover Superior durability from waterproof rip-stop polyester oxford fabric Strong and reliable elastic lining to ensure a snug fit around any pack Reflective strip for added visibility and protection Sizing (in inches): Small- 17x8x29, 35L-50L capacity // Large- 18x10x32, 55L-75L capacity ****Quality Guarantee: We provide only high-quality backpack covers. If you are not fully satisfied for any reason, just contact us by Amazon messaging within 30 days for a full refund of your purchase price.