When a waterproof pack cover is this light (4.6 ounces), bringing it along is no hassle at all. It even comes with its own stuff sack. Made of 30-denier Diamond Ripstop Sil Cordura(R) silicone-impregnated, waterproof finish can't peel or wear off over time. in.No-seam in. construction provides complete waterproofness. Keeper strap helps secure it to the pack and prevents the sides from catching wind as you hike. Mini-siliconized nylon stuff sack remains attached to the cover so it won't get lost. Fits packs 4,300-5,800 cu. in. (70-95 L).