Sea to Summit Hamelin Synthetic Sleeping Bag – 15-Degree Regular | Contour Comfort, Venting & Reversible Quilt

The Sea to Summit Hamelin Synthetic Sleeping Bag is built for backcountry days when damp air, cool nights, and varied terrain are part of the plan. It blends a thermally efficient contour shape with Revive Loft insulation to deliver warmth where you need it most, without unnecessary weight. The result is a versatile sleeping companion that adapts to changing conditions and keeps you comfortable from first light to last light of your trek.

Smart warmth that moves with you

The bag’s contour design follows your body, giving room to side sleep and adjust positions without feeling restricted. Body-mapped Revive Loft insulation concentrates warmth where it matters most, helping you stay cozy as temps dip after sunset while maintaining a compact pack profile.

• Temperature-flexible options across 15° and 30° variants for cool to mild conditions
• Moisture-conscious performance with a bluesign-approved non-PFAS durable water-repellent finish
• Lightweight yet warm insulation that compresses well for backpacking

Ventilation, versatility, and camp-warmth

The Free Flow full-length side zipper with double sliders lets you dial airflow and fully unzip to convert the bag into a flat quilt for lounging around camp. Shoulder snaps close for warmth, while the footbox zipper opens to wear the bag around camp for extra mobility.

• Vent at the head or feet to match changing conditions
• Transform into a flat quilt for resting, drying gear, or sunlit breaks

Durability and sustainability are woven in: the Hamelin uses recycled fabrics and insulation (RCS-certified) and features bluesign-approved materials. Sea to Summit supports responsible gear through the 1% for the Planet program and offers a lifetime warranty against defects in materials or workmanship.

Variant options include 15-Degree Regular, 15-Degree Long, 30-Degree Regular, and 30-Degree Long. For Regulars, the bag measures 77 by 31 inches and weighs about 3.59 pounds, fitting users up to 6 feet 1 inch. Long versions measure 83 by 33 inches and run heavier, suitable for users up to 6 feet 6 inches. These habits fit neatly into backcountry routines—from alpine approaches to misty river camps—without locking you into a single climate.

Possible on-the-ground benefits

In practice, hikers, paddlers, and trekkers may notice easier packing, adaptable warmth, and steadier comfort in damp nights. The bag is designed to support a range of early-season adventures, damp campsites, and variable temps, offering warmth and mobility without overpacking.