Versatile, roomy, and reliably warm.Sea to Summit says:A womens-specific backpack-capable sleeping bag that provides a higher level of comfort than unisex mummy bags. The higher weight compared to a down bag is balanced by the benefits of synthetic insulation in wet/sandy environments.Designed for comfort and performance, the women’s-specific relaxed mummy allows a natural sleeping position without compressing insulation. The full-length side zipper extends throughout the foot box, along with a half-length zipper on the opposite side it provides ventilation and versatility.Our VerdictThe Sea to Summit Hamelin 1C blends reliable performance with a relaxed fit that feels less restrictive than most mummy-style designs. The contoured, women’s-specific fit allows for more natural movement without creating excess dead space, and the anatomically shaped footbox helps maintain warmth where its needed most.The bag is rated to a lower limit of -1 C, and it performs well in those cool spring and autumn temperatures. The double-zip system, full-length on one side, half-length on the other, allows for excellent venting options or even converting the bag into a quilt on warmer nights.At 1479g (Regular), its on the heavier side. Still, the durable 20D shell, smooth-running zip with plough, and thoughtful extras like the draft collar and pillow-compatible hood make it feel like a fully considered system rather than a pared-back option.If youre looking for comfort and resilience across a range of conditions, and dont mind a bit of extra bulk, the Hamelin is a strong all-rounder.- Reviewed by Ultralight Outdoor GearFeaturesBluesign approved, 20D recycled polyester shell with PFC-free WR. 20D bluesign-approved recycled polyester liner.100% RCS-certified, postconsumer, recycled, multidenier synthetic insulation.Free Flow zipper system and relaxed mummy fit for comfort and performance across multiple seasons, varying weather and challenging environments.SpecificationsRegularWeight: 1479gComfort: 3C | 37FLower Limit:-1C | 30FMax User Height: 170cmFit: Contour relaxed mummyLongWeight: 1652gComfort: 3C | 37FLower Limit:-1C | 30FMax User Height: 185cmFit: Contour relaxed mummyMaterial & ConstructionFabric – Bluesign approved, 50D recycled polyester shell, PFC-free DWR. 50D bluesign- approved recycled polyester liner.Insulation – 100% RCS certified, postconsumer recycled, multidenier polyester. Offset insulation avoids cold spotsZip – #5 Side zipper continues through footbox. Zipper plough, double sliders. #5 half length zipper on opposite side.Neck Draft Coller – Front draft collarFoot Box – Generous, anatomically shaped footbox avoids cold spotsDraft Tube – YesPillow Integration – Hood accommodates Regular Aeros PillowHelp & advice:Womens Sleeping Bags How do they differ?The Ultimate Guide to Lightweight Sleeping BagsTime-Saver Guide to Choosing a Sleeping BagSea to Summit Sleeping Bag & Quilt GuideSea to Summit Sleeping Mat GuideAbout Sea to Summit

Versatile, roomy, and reliably warm.Sea to Summit says:A womens-specific backpack-capable sleeping bag that provides a higher level of comfort than unisex mummy bags. The higher weight compared to a down b