Forever ends the debate about whether you can afford the extra weight of a pack cover - the medium size weighs less than 4 ounces and packs into a tiny stuff sack. Features:- Made of 30D Diamond Ripstop silicone impregnated Cordura, so its waterproof finish cant peel or wear off over time- Siliconized Cordura is about one third the weight of traditional coated nylon- This pack cover uses a no seam construction for complete waterproofness- Comes packaged in its own mini siliconized nylon stuff sack that remains attached to the cover so it cant get lost- Comes in four sizes to fit daypacks up to large backpacks Specifications:- Length: 32 in/- Width: 17 in/- Height/Depth: 12 in/- Weight: 4.6 oz /130g- Volume: 70 liter to 95 liter