JUNGLE KING Duck Down Mummy Sleeping Bag – -35°C Winter Rated

Name: JUNGLE KING Ultralight Duck Down Mummy Sleeping Bag – Rated to -35°C, 1.8kg & 2.3kg Options
Brand: Trekker Essentials
SKU: 14:10#2.3kg Navy Blue
Price: 169.03 USD
Availability: InStock

JUNGLE KING Adult Ultralight Mummy Duck Down Sleeping Bag - Trekker Essentials

$169.03

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Color

2.3kg Navy Blue

2.3kg Gary

1 1.8kg Navy Blue

1.8kg Gary

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Engineered for Extreme Cold. Built to Be Carried.

When temperatures plunge and the stakes are high, the JUNGLE KING Ultralight Duck Down Mummy Sleeping Bag delivers. Rated to -20°C comfort / -35°C extreme, this bag wraps you in premium duck down insulation while keeping pack weight to a minimum. Whether you’re winter mountaineering or cold-weather base camping, this is the bag that won’t let you down.

Key Features

Duck Down Insulation – Exceptional warmth-to-weight ratio for serious cold
Temperature Rating – Comfort -20°C / Extreme -35°C
400T Nylon Outer Shell – Durable, lightweight, and wind-resistant
Mummy Cut Design – Contoured fit locks in body heat efficiently
Full-Length Zip with Draft Collar – Seals out cold air at every entry point
Splicing Design – Zip two bags together for shared use
Two Weight Options – 1.8kg (lighter carry) or 2.3kg (extra warmth)
Generous Dimensions – 210 × 85 × 60 cm for comfortable movement

Specifications

Specification	Details
Fill Material	Duck Down
Outer Shell	400T Nylon
Comfort Temperature	-20°C
Extreme Temperature	-35°C
Dimensions (unzipped)	210 × 85 × 60 cm
Fill Weight Options	1.8 kg / 2.3 kg
Shape	Mummy
Splicing	Yes (double bag compatible)
Available Colors	Navy Blue, Gray

Why Choose This Sleeping Bag?

Duck down outperforms synthetic fill at low temperatures — it compresses smaller, weighs less, and insulates better when dry. The JUNGLE KING bag takes that advantage and adds a mummy cut that eliminates dead air space, a draft collar that stops cold from sneaking in at the neck, and a splicing system that lets two bags become one for couples or group warmth. It’s a serious bag for serious conditions.

Ideal For

Winter mountaineering and alpine camping
Cold-weather backpacking
Base camp expeditions
Polar and sub-zero adventures
Couples camping (splicing feature)

In the Box

1 × JUNGLE KING Duck Down Mummy Sleeping Bag
Compression storage bag

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Product details

Duck Down Insulation – Premium duck down fill delivers an exceptional warmth-to-weight ratio, outperforming synthetic insulation in extreme cold while compressing to a fraction of its lofted volume.

Extreme Temperature Rating – Rated to -20°C comfort and -35°C extreme, engineered for serious winter mountaineering and sub-zero expeditions where failure is not an option.

400T Nylon Outer Shell – Durable, lightweight, and wind-resistant shell fabric that shields the down insulation from moisture and wind penetration.

Mummy Cut Design – Body-contoured shape that eliminates dead air space around the sleeper, locking in body heat more efficiently than rectangular bags.

Full-Length Zip with Draft Collar – Comprehensive cold-air sealing system that blocks drafts at the zipper line and neck, the two most common heat-loss points in sleeping bags.

Splicing Design – Two bags of the same model can be zipped together to create a shared double-width sleeping system for couples or shared warmth in extreme cold.

Two Weight Options – Choose between 1.8 kg for lighter carrying on the trail or 2.3 kg for maximum warmth during stationary base camp use.

Generous Dimensions – 210 × 85 × 60 cm interior provides room for comfortable movement during sleep, even for taller users.

What is the difference between the 1.8 kg and 2.3 kg options?

Both share the same dimensions and shell material. The 2.3 kg version has more duck down fill, providing extra insulation for stationary base camp use in the coldest conditions. The 1.8 kg version is lighter for carrying on the trail while still rated to -20°C comfort.

Can this sleeping bag really handle -35°C?

-35°C is the extreme survival rating, meaning you will survive but may not sleep comfortably at that temperature. The comfort rating of -20°C is where the bag provides comfortable, restful sleep for most users.

Can I zip two bags together?

Yes. The splicing design allows two bags of the same model to be zipped together, creating a double-width sleeping system for couples or shared body warmth in extremely cold conditions.

How should I store this sleeping bag when not in use?

Store loosely in a large breathable cotton or mesh bag — never in the compression sack for extended periods. Prolonged compression damages the duck down's ability to loft fully, reducing insulation performance over time.

What does the draft collar do?

The draft collar is an insulated tube around the neck opening that seals the gap between your body and the bag when zipped up. It prevents cold air from entering through the top of the bag, which is one of the main sources of heat loss.

Is duck down or goose down better?

Both provide excellent insulation. Goose down typically has a slightly higher fill power at the same weight, but duck down offers an excellent warmth-to-weight ratio at a more accessible price point. For the extreme temperature ratings of this bag, duck down performs exceptionally well.

What is the packed size of this sleeping bag?

When compressed in the included stuff sack, the bag packs down to a compact size suitable for backpacking. The 1.8 kg version compresses smaller than the 2.3 kg version due to less fill volume.

Is the 400T nylon shell waterproof?

The 400T nylon shell is wind-resistant and provides a degree of water resistance against light moisture and morning dew. However, it is not fully waterproof, so use a tent or bivy for protection in rainy conditions.