Sea to Summit Spark Sleeping Bag

The Spark is rated for 45 degrees Fahrenheit. It is designed as an ultralight summer bag or a liner-compatible option for shoulder-season trips where weight is the primary concern.

This bag is cut slightly wider at the hips and narrower at the shoulders to better match female anatomy. This tailored shape minimizes dead air space, which helps the down insulation trap heat more efficiently.

Yes, the bag uses 850+ fill power goose down that is RDS (Responsible Down Standard) certified. This ensures the down comes from animals that have not been subjected to unnecessary harm.

The half-zipper is a weight-saving feature that requires a bit more maneuvering than a full-length zip. While it keeps the bag ultralight, those who prefer a more open feel or easier ventilation might find it slightly more restrictive.

The 10D nylon shell features a non-PFAS DWR treatment that effectively sheds light moisture and condensation. While it is water-resistant, it is not waterproof, so it is best paired with a tent or bivy in wet conditions.

Absolutely. With a compressed volume of just 2.9 liters, it is exceptionally packable. It is an ideal choice for ultralight backpackers who need to save space in their pack without compromising on warmth.