Sea to Summit Spark Sleeping Bag

This bag is designed for ultralight adventures with a temperature rating of 45 degrees Fahrenheit. It is best suited for late spring, summer, and early autumn trips rather than freezing winter conditions.

It is exceptionally compact, compressing down to just 2 liters. This makes it an ideal choice for ultralight backpackers who need to save space in their pack.

Yes, the Spark features a full-length YKK zipper that allows it to be coupled with other compatible Sea to Summit sleeping bags, provided the zipper sides align correctly.

The Spark uses a water-resistant shell fabric designed to manage moisture effectively. While it is not waterproof, it will handle light condensation or damp tent walls without compromising the down insulation.

The anatomical footbox is shaped to follow the natural position of your feet while you sleep. This design prevents the down insulation from being compressed by your feet, ensuring better heat retention in a critical area.

The 850+ fill power goose down offers a much higher warmth-to-weight ratio than synthetic alternatives. It allows the bag to be incredibly lightweight and compressible while still providing excellent thermal efficiency.