Sea to Summit Spark Sleeping Bag

This bag features a body-mapped anatomical shape that is wider at the hips and narrower at the shoulders compared to unisex models. This design reduces dead air space, allowing your body heat to warm the interior more efficiently.

Yes, it is designed to handle moisture better than standard down bags. The 850+ fill power goose down is treated with a non-PFAS water-repellent finish, which helps the insulation maintain its loft and warmth even if it gets slightly damp.

It is exceptionally packable. With a compressed volume of just 2.9 liters and a total weight of 14.9 ounces, it takes up minimal space in your pack, making it an ideal choice for ultralight setups.

No, this is a 3-season bag with a temperature rating of 45°F. It is best suited for late spring, summer, and early autumn trips where temperatures remain mild.

The bag uses a snag-free YKK #5 zipper equipped with a zipper plough. This hardware is specifically designed to prevent the lightweight 10D fabric from getting caught in the zipper track.

The 10D nylon is chosen for its ultralight weight and high breathability. While it is very thin to save ounces, it is durable enough for backcountry use provided you treat it with reasonable care.