The Sea to Summit® Pack Cover is lightweight and compact when not in use, but expands to completely cover your hiking pack. This Sea to Summit backpacking cover is made of lightweight 70d nylon to product backpacks from moisture and dirt. It's contoured to fit most packs, and is seam-sealed for further protection. The Sea to Summit Pack Cover stores in its own stuff sack and it is lightweight to take along for hiking trips in wet or dusty conditions. Imported.