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Jumpstart your spring camping with the Sea To Summit Spark 15F Down Sleeping Bag. Coming in under two pounds, the Spark fits easily into our bag for early springtime expeditions skiing to backcountry yurts and late fall trips to stunning vistas where we can watch the leaves change color. The warm 850-fill down is treated with an Ultra Dry treatment to maintain loft in damp conditions, and a DWR treatment sheds condensation in our tent so we can sleep comfortably through the night.