The cirrus waterproof sack from sealline is a fantastic ultra lightweight dry sack that has been constructed with 100 waterproof durable materials with a water resistant roll down closure making it ideal for when you need to keep your items dry while keeping pack weight to a minimum the cirrus dry sacks come in different sizes so whether it is your sleeping bag and clothes you need to keep dry when embarking on a long hiking holiday or whether you need to protect your possessions from splashes a