Sea to Summit Spark Sleeping Bag

This bag features a unique anatomical shape that is narrower at the shoulders and wider through the hips and knees. This design reduces dead air space, which helps you warm up the bag faster and retain heat more efficiently.

The 10D nylon is chosen specifically for its ultralight weight, so it requires a bit more care than heavier fabrics. While it is durable enough for standard backcountry use, you should avoid placing it directly on sharp rocks or rough ground without a sleeping pad.

The Spark series covers a broad temperature range from 7°C (45°F) down to -9°C (15°F), depending on the specific model you choose. It is designed to be versatile, so ensure you select the specific version that aligns with the coldest temperatures you anticipate on your trips.

The bag uses RDS-certified 850+ fill power goose down, which is treated to be water-resistant, and the shell features a PFC-free DWR coating. While this helps protect against light condensation and dampness, it is not waterproof, so you should always use a dry bag or pack liner to keep it dry during transit.

The maximum user height for this sleeping bag is 185 cm, which is approximately 6 feet. If you are right at that height limit, you may find the fit quite snug, and you might prefer a longer bag for more comfort.

The bag is equipped with a YKK #5 zipper specifically engineered for snag-free operation. While the fabric is lightweight, the zipper track is designed to prevent the material from getting caught during quick entries or exits.