What Our Gearhead® Experts Are Saying: “This is the bag I point to for fast-and-light trips where nights stay mild but variable. It packs incredibly small, vents well, and still feels like a true sleeping bag—not a fragile summer quilt.”When miles matter and nights stay relatively warm, the Spark Pro Down Sleeping Bag 30°F keeps your kit lean without cutting corners on comfort. It’s built for summer and shoulder-season trips where you’re moving fast, sleeping light, and still want reliable rest before another early start. Sea to Summit balances minimal weight with real versatility, so you’re not locked into a single temperature window.The bag uses 950+ fill-power RDS-certified goose down with a non-PFAS Ultra-Dry Down treatment to maximize loft while resisting moisture. Ultralight, highly breathable 10-denier shell and liner fabrics keep airflow moving on warmer nights. A technical hood, draft collar, and anatomical footbox add structure and comfort when temperatures dip, while the Free-Flow Zip system lets you vent heat through the side, shoulder, or footbox—or open the bag fully into a quilt when conditions allow.
Responsible Collection: Responsibly Sourced, [stuff sack] bluesign® APPROVED, Recycled/Repurposed;
Material: 10D nylon, non-PFAS DWR treatment;
Insulation: 950+-fill goose down (RDS-certified);
Shape: mummy;
Zipper: Free-Flow;
Max User Height: [regular] 6ft 1in, [long] 6ft 6in;
Shoulder Circumference: [regular] 61in, [long] 65in;
Hip Circumference: [regular] 53in, [long] 57in;
Foot Circumference: [regular] 40in, [long] 44in;
Bag Length: [regular] 77.2in;
Draft Tube: draft collar, adjustable hood;
Pockets: none;
Pad Retainer: no;
Venting: 1/2-zip side;
Fill Weight: [regular] 10.9oz, [long] 12.6oz;
Degree: 30°F;
European Norm/ISO Comfort Rating: 37°F;
European Norm/ISO Lower Limit Rating: 30°F;
Storage Sack: not included;
Stuff Sack: 8L 40D recycled nylon compression bag included;
Stuff Size: 5.3L;
Claimed Weight: [regular] 1lb 5.8oz, [long] 1lb 7.7oz;
Activity: ultralight backpacking;
Manufacturer Warranty: lifetime;
storecredits: 0.0;
Style Variants
Available Colors: Beluga Black
Size Reference for Sea to Summit Sleeping Bag: 30F Down
Available Sizes: Long, Reg
