Sea to Summit Spark Pro Ultralight Down Sleeping Bag 30°F, Regular

Meet the Sea to Summit Spark Pro Ultralight Down Sleeping Bag, a technical bag engineered for warmth at the lightest weight and smallest packed size. The mummy silhouette helps seal out drafts while you rest under the stars, making it a practical companion for backpacking, bike packing, and touring where every gram matters.

Lightweight warmth with high loft

Inside, premium down keeps you cozy without bulk. The insulation is 950+ fill power goose down, Responsible Down Standard certified, and treated with Ultra-Dry Down to help loft stay strong when damp. The exterior shell uses a featherweight 10D nylon with a PFC-free DWR, paired with a breathable 10D liner for comfort against the skin.

• 950+ fill power down insulation (RDS certified) treated with Ultra-Dry Down to improve moisture tolerance and loft retention
• Featherweight 10D nylon shell with a PFC-free DWR finish for water resistance in light moisture
• Breathable 10D liner enhances comfort by reducing heat buildup
• Free Flow Zip System with YKK zippers for smooth, snag-free venting and easy bag opening
• Two temperature options available: 30°F and 15°F, with temperature-specific baffle layouts

Designed for real-world conditions

The Spark Pro combines comfort and efficiency for active travelers. A contoured mummy shape includes a hood and a draft collar that wraps around the neck, with an oversized shoulder area to accommodate a natural sleep posture. The 30°F model uses hybrid box baffles in the torso for warmth while employing sewn-through baffles in the leg area to save weight. The 15°F model uses full box baffles for maximum warmth when nights drop colder. The 10D shell and liner balance warmth with breathability, while a YKK #5 side zipper and additional zippers at the footbox and shoulder minimize bulk.

• Contoured mummy fit with a hood and draft collar for warmth isolation
• Hybrid box baffles in the torso (30°F) with sewn-through legs to reduce weight
• Full box baffles (15°F) for enhanced warmth in cold conditions
• Free Flow Zip allows full ventilation and the option to lay the bag flat as a quilt
• Includes Ultra-Sil compression sack and a storage cube for simple packing and storage

Two size options, Regular and Long, plus two temperature ratings, give you flexibility for different adventures. While no product can guarantee outcomes, the Spark Pro is designed to offer dependable warmth, compact packing, and everyday comfort in a compact, durable package. Sea to Summit backs the bag with a lifetime guarantee against defects in materials or workmanship.