Sea to Summit Spark Sleeping Bag

The Spark is cut with a slightly wider hip area and a narrower shoulder width to better match female anatomy. This body-mapped shape reduces dead air space, helping you warm up the bag faster and stay warmer throughout the night.

The 39°F rating is ideal for mild summer nights or early autumn trips where temperatures don't dip below freezing. If you tend to sleep cold, you may want to pair this with a high-R-value sleeping pad or a liner to extend its range.

No, it is not waterproof. The Non-PFAS Ultra-Dry Down treatment helps the down feathers resist moisture and maintain their loft in damp conditions, but the 10D nylon shell is not designed to withstand direct rain or heavy condensation.

Yes, the Spark features a YKK #5 zipper that allows it to be coupled with other compatible Sea to Summit sleeping bags. This is a great feature if you want to share warmth or create a double-bag setup.

It is exceptionally packable. With a compressed volume of just 2.9 liters and a weight under one pound, it takes up minimal space in your pack, making it a top-tier choice for weight-conscious hikers.