Sea to Summit Spark SPIII and SPIV
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The Spark series is a specialty product for people who are focused on finding the lightest gear. The graph shows that the Spark III and IV are outliers in a good way, providing a fair amount of extra warmth for the weight. The Spark III is really a minus two degree bag and the Spark IV is really a minus five degree bag.
The most controversial feature of the Spark series is the zipper. It's a two-way zipper, meaning that you can open it from the top or the bottom, and it's a full-length zipper, meaning that you can open it all the way up. This is great for ventilation, but it also means that you can't really use it as a quilt.
Overall, the Sea to Summit Spark SPIII and SPIV are some of the lightest and warmest sleeping bags on the market. They are made with some of the lightest and most advanced materials, and they are very compressible. #sleepingbag #seatosummit #spark #warmth #weight #compressibility
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