Sea to Summit Womens Hamelin -1C/30F Synthetic Sleeping Bag

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Versatile, roomy, and reliably warm.

Sea to Summit says: 

A women’s-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 Verdict

The Sea to Summit Hamelin −1°C 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 it’s 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), it’s 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 you’re looking for comfort and resilience across a range of conditions, and don’t mind a bit of extra bulk, the Hamelin is a strong all-rounder.

– Reviewed by Ultralight Outdoor Gear

Features

• Bluesign 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.

Specifications

Regular

• Weight: 1479g
• Comfort: 3°C | 37°F
• Lower Limit:-1°C | 30°F
• Max User Height: 170cm 
• Fit: Contour – relaxed mummy

Long

• Weight: 1652g
• Comfort: 3°C | 37°F
• Lower Limit:-1°C | 30°F
• Max User Height: 185cm 
• Fit: Contour – relaxed mummy

Material & Construction

• Fabric – 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 spots
• Zip – #5 Side zipper continues through footbox. Zipper plough, double sliders. #5 half length zipper on opposite side.
• Neck Draft Coller – Front draft collar
• Foot Box – Generous, anatomically shaped footbox avoids cold spots
• Draft Tube – Yes
• Pillow Integration – Hood accommodates Regular Aeros Pillow

Help & advice:

• Women’s Sleeping Bags – How do they differ?
• The Ultimate Guide to Lightweight Sleeping Bags
• Time-Saver Guide to Choosing a Sleeping Bag
• Sea to Summit Sleeping Bag & Quilt Guide
• Sea to Summit Sleeping Mat Guide
• About Sea to Summit