The Sea to Summit Spark Pro Ultralight 15F Down Sleeping Bag is engineered for backpackers who demand warmth without the bulk. Featuring RDS-certified 950+ fill-power goose down treated with a non-PFAS Ultra-Dry Down process, it offers exceptional thermal performance even in damp conditions.
- Featherweight 10-denier nylon shell with durable water repellent finish ensures protection against light moisture.
- Highly breathable 10-denier nylon liner enhances comfort for a restful night’s sleep.
- Ergonomic mummy shape with anatomic footbox and technical hood balances ultralight design with roomy comfort.
- Free-Flow Zip System enables adjustable ventilation and the option to unzip fully for use as a quilt.
- YKK zippers provide reliable, snag-free operation while minimizing weight.
- Front draft collar and box wall baffle construction lock in warmth efficiently.
Ideal for winter camping and backpacking, this down sleeping bag meets the needs of those who want the best ultralight sleeping bag for backpacking without sacrificing warmth. Whether you’re looking to buy a down sleeping bag for winter camping or need a cheap lightweight sleeping bag for travel, this model delivers high-performance insulation and comfort in a compact package.
Randy Davenport (verified owner) –
I’ve used the Spark Pro on several backpacking trips and it’s by far the best ultralight sleeping bag for backpacking I’ve owned. It keeps me warm in cold conditions without the bulk.
Sharon Best (verified owner) –
This down sleeping bag exceeded my expectations. It’s incredibly light yet warm, and the breathable shell makes camping comfortable even when temperatures drop.
Kevin Jones (verified owner) –
After reading multiple reviews of Sea to Summit Spark Pro sleeping bag, I decided to buy one for winter camping. It’s held up well against cold nights and packs down smaller than any bag I’ve had before.