This is the SEA TO SUMMIT Ultra-Sil Pack Cover, an ultralight backpack cover. It's an essential item for sudden rain protection during mountain climbing and hiking. It packs down very compactly, so it won't get in the way at all if you keep it in your backpack as a precaution. The seamless construction provides excellent waterproofness. Brand new, unused, stored at home. Color: Blue Capacity: 15-30L Weight: Approximately 57g Material: 30D Cordura nylon (silicone treated) Shipping method: To reduce thickness, it will be folded and shipped without the stuff sack. #RainCover #BackpackCover