Best Trek -18C Down Sleeping Bag Down Sleeping Bags

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The Sea to Summit Trek -18°C Down Sleeping Bag is ideal for cold-weather camping. Its comfort rating of -11°C and 650+ Fill Power Duck Down provides excellent insulation and warmth. The semi-rectangular fit and ergonomic design offer ample space and comfort.

Sea to Summit says: 

The Trek Down Sleeping Bag is the perfect option for vehicle-based travels and overnight camping. With 650+ FILL Power, this versatile and spacious bag uses an ergonomic design to offer additional warmth and comfort.

Our Verdict

warmth on winter backpacking and car camping trips. With a comfort rating of -11°C and a comfort limit of -18°C, this sleeping bag ensures you stay warm even in harsh conditions. The 650+ Fill Power Duck Down, treated with Ultra Dry Down for improved water resistance, offers excellent insulation while remaining resilient in damp environments.

Designed with a semi-rectangular fit, the Trek -18°C provides ample space for a comfortable night’s sleep. This spacious design is particularly suited for car camping and shorter outdoor adventures where comfort is paramount. The bag’s ergonomic design includes features like double draft collars and a generous fitted hood with soft-touch adjustments, which help retain warmth effectively.

The Free Flow Zip System adds to the bag’s versatility, allowing for easy temperature regulation and multiple sleeping configurations. Whether you need to ventilate on milder nights or seal in warmth during frigid temperatures, this bag adapts to your needs seamlessly. Weighing 1894g and compressing down to 26L, it is relatively lightweight and compact.

Constructed from recycled 20-denier Polyester, the Trek -18°C balances durability with environmental responsibility. The thoughtful design includes vertical chest baffles and horizontal baffles at the lower half and base, ensuring even down distribution and preventing cold spots.

– Reviewed by Ultralight Outdoor Gear

Features

• Duck Down with Ultra Dry Down treatment for improved water  resistance in damp conditions.
• Recycled polyester offers durability and comfort for lightweight  adventures in a range of climates and conditions.
• The Free Flow Zip System offers temperature regulation and  multiple sleeping bag configurations for added freedom in the outdoors.
• The Semi Rectangular Fit features a spacious design for added  comfort and room that is best suited to car camping and  shorter adventures.

Specifications

Temperature Rating

• EN13537:2012 Comfort: -11°C | 12°F
• EN13537:2012 Comfort Limit: -18°C | 0°F

Specs

• Weight: 1894g (excludes storage bags)
  
• Fill weight: 1000g
  
• Fits up to: 6 ft / 185cm
• Internal Width Shoulder: 158cm
• Internal Width Waist: 149cm
• Internal Width Feet: 119cm
• Compressd Size: 26L

Fit

• Semi-rectangular fit: Spacious and generous, a roomy fit for car camping and the occasional overnighter.

Materials & Construction

• Insulation: 650+ FILL Power, RDS-certified, Duck Down with Ultra Dry Down treatment for improved water resistance in damp conditions
  
• Fabric: Recycled 20-Denier Polyester shell and lining.
• Zipper: Free Flow Zip System: Primary zip – full length #5 with zip-plow and two sliders.
  Secondary zip – 1/2 length #5 with zip-plow and two sliders.
  Footbox zip – #5 with two sliders.
• Baffle Construction: Vertical chest baffles, horizontal baffles lower half and base, box wall baffle construction throughout.
• Collar: Double draft collars: fitted front collar and tubular back collar.
• Hood: Generous fitted hood with two soft touch adjustments. Fits a Sea to Summit regular pillow.
• Draft Tube: Single, synthetic-filled, draft  tube along the top of all zippers.
• Intergration: Pairs with Women’s Sea to Summit bags, and STS quilts.

Help & advice:

• The Ultimate Guide to Lightweight Sleeping Bags
• Time-Saver Guide to Choosing a Sleeping Bag
• Sea to Summit Sleeping Bag & Quilt Guide
• About Sea to Summit
• The EN13537 Standard
• All About Down