The new ultralight version of the excellent all around waterproof compression stuff sack from Sea To Summit. Perfect for things like sleeping bags, tents, puffy jackets, and other bulky clothing items. The main body of this stuff sack is made with ultralight waterproof 30D Ultra-Sil Nylon Fabric. The unique base is made with waterproof eVent fabric that is also air-permeable, and this allows the air to push out through the base panel as you compress the stuff sack. This makes it much easier for you to fully compress the stuff sack while keeping your items dry inside. The slippery sil nylon fabric also makes these easier to push and pull in and out of backpacks. Other features include a hypalon non-wicking roll-top closure, four compression straps, a nylon webbing handle, and a DWR durable water repellent finish.