The Spark II has the same streamlined, feather-weight design as the Spark I with additional proportional 850+ down fill to take you into cooler summer through fall temps. The Spark is the lightest and most compact technical sleeping bag Sea to Summit makes. It's an excellent summer bag whether you're hiking, bikepacking or cycle touring. It also works as a booster bag, slipping inside another sleeping bag to add warmth. Ultra light and mummy shape, it has everything you need to keep you warm and it will hardly take up any space.
