Down Mummy Sleeping Bag, -13°C Extreme Cold Weather Winter Bag

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Description

Premium Down, Shared Warmth — From Solo Setup to Double Comfort

The Traverseon Down Mummy Sleeping Bag is designed for versatile warmth. Its mummy-style shape effectively retains heat while providing a snug and comfortable sleeping experience. The adjustable outdoor hood and precision-engineered double-track zipper prevent cold drafts, keeping you warm throughout chilly camping nights. Measuring 210cm × 80cm × 50cm, it fits most heights and can be used as a single winter sleeping bag or zipped together with another bag to create a seamless double sleeping bag, providing warmth while still allowing ample room for movement.

The soft inner lining feels comfortable against the skin. Filled with premium goose and duck down, it delivers exceptional loft and an outstanding warmth-to-weight ratio—offering up to 35% more heat retention with 30% less bulk compared to cotton or synthetic sleeping bags. Rated from +15°C to −13°C, it keeps you efficiently warm even in extreme cold. Lightweight and compressible, it’s perfect for backpacking or any outdoor adventure where space and weight are key considerations.

Whether for camping, hiking, or alpine exploration, this ultralight down sleeping bag ensures you stay warm in the cold without adding extra bulk.

Functions

High-End Down Insulation for Comfortable Warmth in Low Temperatures
Filled with high-loft goose and duck down, providing up to 3% higher thermal efficiency per gram than synthetic materials while maintaining loft after compression. The box-shaped baffle design prevents down from shifting, making it ideal for base camps, elk camps, and other diverse and challenging camping environments, ensuring consistent warmth even in low temperatures.

Five Fill Weight Options for Lightweight, Unrestrictive Warmth Covering +15°C to −13°C
The sleeping bag offers fill weights ranging from 400–1200 g, allowing you to choose the level of insulation needed. The down is lightweight and does not feel heavy on the body. Suitable for temperatures from +15°C to −13°C, it can be used solo from spring to early winter, or layered inside a larger sleeping bag or waterproof bivy for extreme cold—perfect for modular sleep systems.

Dual-Track Zipper Design for Draft Blocking and Anti-Snag Performance
Smooth dual-track windproof zippers prevent snagging and seal the sleeping bag tightly to reduce heat loss and enhance warmth retention. Two sleeping bags can be zipped together to form a spacious double bag, reducing joint heat loss by up to 30%. Fully unzipped, it transforms into a double quilt, picnic blanket, or car mattress, perfect for RV travel, family tents, or cozy cabin stays.

Mummy-Shaped Design for Effective Heat Retention and Comfort
A roomy mummy cut combined with a neck-contoured hood and a 3D footbox supports natural spinal alignment and ankle movement. Side sleepers and taller users can adjust positions freely without tension or pressure points, staying warm without feeling restricted.

Spacious Interior for Tall Users
Measuring 210 × 80 × 50 cm, the sleeping bag provides ample space and length for most users, including taller campers, allowing freedom of movement without feeling cramped while maintaining warmth.

Soft, Skin-Friendly Lining for Enhanced Sleeping Comfort
The soft taffeta lining features anti-static and anti-stick technology that prevents fabric from clinging to clothing, offering bedsheet-like comfort—lightweight, breathable, and ideal for long nights outdoors.

400T Windproof Outer Shell for Cold and Dew Protection
The 400T nylon fabric offers excellent weather resistance, protecting against light rain, mist, and frost. It dries quickly under sunlight, keeping the sleeping bag warm and dry throughout the trip.

Full-Coverage Insulation Design Adds up to +3°C Warmth
The adjustable hood, saddle-style draft collar, and dual-track zipper design provide full-body insulation, effectively preventing cold air intrusion and increasing perceived warmth by up to 3°C from head to toe.

Ultralight and Smart Packing for Quick, On-the-Go Storage
Starting at just 0.85 kg, lighter than synthetic sleeping bags with similar warmth. Compresses to approximately 21 × 18 cm (0.85 kg) or 21 × 29 cm (1.65 kg). The pre-shaped compression sack reduces repacking time by 25%, making it ideal for hikers who need to manage weight and space. Available in 8 colors such as red, army green, wine red, and lake blue for both style and team visibility.

Parameters

Size
210×80×50cm
Fill
Duck down feathers + Goose down feathers
Weights
400g, 600g, 800g, 1000g, 1200g
Net Weight
0.85kg, 1.05kg, 1.25kg, 1.45kg, 1.65kg
Temp Range
+15°C → -13°C
Outer and Inner material
400T Waterproof and Tear-resistant Breathable Nylon
Zipper
YKK full-length convertible zippers
Pillow
Integrated dual raised neck zones
Use Mode
Single or Double
Compression Sizes
Max 21*29cm → Min 18*21cm
Color
Red, Dark Blue, Blue, Black, Lake Blue, Wine Red, Orange-Yellow, Gray, Army Green

FAQs

What temperatures is this sleeping bag suitable for?

This down mummy sleeping bag is rated for a temperature range of +15°C to −13°C. In general, lighter fills (around 400–600 g) are best for cool spring and autumn nights, while heavier fills (800–1200 g) are better for late-autumn, winter camping, and colder alpine conditions. Actual comfort will also depend on your clothing, sleeping pad, shelter, and how warm or cold you usually sleep.

How do I choose between the 400g, 600g, 800g, 1000g, and 1200g fill options?

All five options use the same goose-and-duck down blend and 400T nylon shell; the difference is insulation level: 400 g / 600 g – For milder conditions and warmer sleepers, ideal for late spring to early autumn or as an inner bag in a modular system. 800 g – A versatile choice for most 3–4 season trips where temperatures may approach freezing. 1000 g / 1200 g – For cold sleepers or harsher winter conditions closer to the lower end of the +15°C to −13°C rating, or when you expect frost and sub-zero nights.

Is this down sleeping bag waterproof?

The outer shell uses 400T windproof, water-resistant nylon that sheds light rain, mist, and condensation, helping keep the down insulation dry. However, it is not a fully waterproof bivy. For heavy rain or wet ground, it should be used inside a tent, bivy, or other shelter to protect it from prolonged water exposure.

How should I wash and care for the down filling?

To preserve loft and warmth, we recommend gentle care: Spot clean when possible instead of frequent full washes. For deeper cleaning, use a front-loading washer on a gentle cycle with down-specific or mild detergent; avoid fabric softener and bleach. Tumble dry on low heat with clean dryer balls or air-dry thoroughly until the down is fully fluffed and dry. Store the bag loosely in a large storage sack or on a shelf, not compressed long-term, to maintain loft and performance.

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Down Mummy Sleeping Bag, -13°C Extreme Cold Weather Winter Bag | Traverseon

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