What to look for

Sleeping Bag Temperature Ratings

Most three-season campers are covered by a bag rated around 30°F. If you camp in shoulder seasons, sleep cold, or head above treeline, look at 15°F or 0°F. Warm-weather trips can use 45°F bags when nights stay mild.

Down vs. Synthetic

Down (Spark, Trek, Ascent) packs smaller and weighs less for the warmth. Synthetic (Boab, Hamelin) stays more useful when you expect damp camps and need easier care. Women's models use a shorter, narrower cut with extra insulation where it helps.

Current Sea to Summit bags

Spark and Spark Women's cover ultralight down from 45°F to 0°F. Trek and Trek Women's are versatile down bags for mixed trips. Boab and Hamelin (including Hamelin Women's) are synthetic options for wetter camps and value-minded kits. Shipping cost and timing show at checkout.