Therm-a-Rest Saros 0F/-18C Synthetic Mummy Sleeping Bag – Small

Overview

When cold, damp nights threaten your sleep, the Therm-a-Rest Saros 0F/-18C synthetic mummy sleeping bag is designed to help you rest more comfortably. It uses EraLoft synthetic insulation that dries quickly and resists moisture, making it a solid choice for backpackers and mountaineers who encounter damp conditions from spring to fall.

The bag's fit has been optimized in Therm-a-Rest's cold chamber to offer a W.A.R.M. (With Additional Room for Movement) design. This means you can change positions without sacrificing warmth or bulk, a real-world benefit when you’re trying to find that perfect sleeping position after a long day on the trail.

Key advantages

• EraLoft synthetic fill insulation is efficient, compressible, and water-resistant, helping you stay warm without heavy packing.
• W.A.R.M. fit provides space for various sleep positions while preserving thermal efficiency.
• SynergyLink Connectors integrate the bag with a pad for improved comfort and consistent warmth, while Zoned Insulation targets key areas to save weight.
• Weather resilience and quick-drying properties help you recover faster after damp conditions and overnight dew.

Size, weight, and what's included

Available in Small, Regular, and Long to fit a range of heights and preferences. Small measures 73x29x5.5 inches, fits up to 5'6", packs to 11x12 inches, and weighs 4.31 pounds. Regular measures 80x31.5x5.5 inches, fits up to 6', packs to 11x12 inches, and weighs 4.94 pounds. Long measures 85x33x5.5 inches, fits up to 6'6", packs to 11x12 inches, and weighs 5.25 pounds. Each bag includes a storage sack and a compression sack, and Therm-a-Rest backs it with a limited lifetime warranty.

Real-world uses

Picture alpine bivouacs, riverside camps, or damp forest nights where a lightweight bag can make a difference. Pair it with a compatible pad to maximize comfort and warmth, creating a versatile setup for three-season trips from spring through autumn.

Care and durability

EraLoft insulation offers quick-drying performance and moisture resistance, while the bag’s shell is designed to endure varied outdoor conditions. Follow the included care guidelines to maintain loft and warmth over many adventures.