Sea to Summit Spark Sleeping Bag

The Spark is cut with a women-specific shape that is slightly narrower in the shoulders and wider through the hips and knees. This geometry accommodates natural sleeping positions and side sleeping, ensuring you don't feel restricted while maintaining thermal efficiency.

This bag is rated for 45 degrees Fahrenheit, making it a dedicated summer-weight bag. It is best suited for warm nights and ultralight trips where temperatures are unlikely to drop near freezing.

Extremely packable. Thanks to the 850+ fill power down and ultralight 10D nylon materials, the bag compresses down to just 2.9 liters, taking up minimal space in your pack.

While the shell features a non-PFAS water-repellent treatment to handle condensation and humidity, it is not fully waterproof. It is designed to protect the down insulation from dampness, but you should still use a bivy or tent for full weather protection.

The bag uses a YKK #5 zipper equipped with a snag-free plough. This design helps guide the fabric away from the zipper teeth, significantly reducing the chance of getting stuck during middle-of-the-night exits.