Sea to Summit Spark Sleeping Bag

This bag is cut narrower at the shoulders and wider through the hips and knees. This shape accommodates a more natural sleeping position, especially for side sleepers, and reduces dead air space that your body would otherwise have to work harder to heat.

Yes, it features a non-PFAS water-repellent treatment on both the shell fabric and the down insulation itself. While it is not waterproof, this treatment helps the down maintain its loft and warmth if you encounter condensation or light moisture inside your tent.

With a temperature rating of 45°F, this is a lightweight bag designed for mild summer nights or as a warm-weather backpacking option. It is not intended for freezing temperatures or high-alpine environments.

It is highly compressible, packing down to a volume of just 2.9 liters. It is an excellent choice if you are trying to minimize your pack size for ultralight trips.

The bag uses a YKK #5 zipper specifically chosen for snag-free operation. While no zipper is entirely immune to catching on lightweight fabric, this design is engineered to minimize those frustrations.