Alaska -20°F 4.43 lb Ultralight Duck Down Mummy Sleeping Bag for Extreme Cold Weather Backpacking & Mountaineering

$349.99 USD

Alaska -20°F 4.43 lb Ultralight Duck Down Mummy Sleeping Bag for Extreme Cold Weather Backpacking & Mountaineering

Name: Alaska -20°F 4.43 lb Ultralight Duck Down Mummy Sleeping Bag for Extreme Cold Weather Backpacking & Mountaineering
Brand: Eusebio Sporting USA
SKU: SBMU-EXBK-001
Price: 349.99 USD
Availability: InStock

$349.99 USD

Shipping calculated at checkout.

Key Features

Temperature Rating: -20°F (-29°C)
Weight: 4.43 lb
Premium 90/10 duck down insulation
Ultralight mummy sleeping bag design
50D polyester shell with PFAS-free water-repellent finish
Soft 50D polyester lining
Insulated hood with adjustable drawcord
Insulated collar and zipper baffles
Anatomically shaped footbox
Built-in pillow sleeve
Zippered footbox storage pocket
Buckle-release compression bag included
Fits users up to 78 in tall
Ideal for winter camping, mountaineering, backpacking, expedition travel, and alpine adventures

Product Description

The Alaska -20°F Duck Down Mummy Sleeping Bag is designed for extreme cold-weather adventures where warmth, packability, and weight matter most. Filled with premium 90/10 duck down insulation, this ultralight sleeping bag delivers exceptional loft and compressibility while maintaining a trail-ready weight of just 4.43 lb.

The contoured mummy shape is engineered to reduce excess internal space while providing a comfortable fit for cold-weather camping, mountaineering, backpacking, and alpine expeditions. An insulated hood, adjustable drawcord system, insulated collar, and zipper baffles work together to create a secure sleeping environment in demanding outdoor conditions.

Built with a durable 50D polyester shell featuring a PFAS-free water-repellent finish, the Alaska sleeping bag is designed for use in a wide range of outdoor environments. Additional features include an anatomical footbox, zippered footbox storage pocket, built-in pillow sleeve, and a buckle-release compression bag that helps reduce packed size for easier transport.

Whether you're tackling winter backpacking routes, mountaineering objectives, or remote cold-weather camps, the Alaska -20°F provides premium down insulation, compact packability, and lightweight performance for serious outdoor adventures.

-20°F

86.6 x 31.5 x 21.7 in

4.43 lb

90/10 Duck Down

Details:

Premium Down Insulation for Extreme Cold:
High-quality down insulation provides superior loft, compressibility, and warmth-to-weight performance. The low-bulk construction allows serious cold-weather protection in a compact, packable form — ideal for winter backpacking and alpine trekking.

Compared to synthetic-only sleeping bags, down insulation delivers better thermal efficiency in extreme cold conditions.

Technical Mummy Design for Maximum Heat Retention:
The mummy shape reduces internal air space to trap body heat efficiently. An insulated warm collar with adjustable concealed drawcord creates a custom seal against drafts.

The shaped foot box improves warmth and comfort, while wind baffles along the zipper prevent heat loss.

Why Choose a Alaska Mummy Sleeping Bag?

A Alaska sleeping bag is designed for extreme cold conditions where temperatures drop well below freezing. The combination of down insulation, mummy shape, insulated collar, and draft baffles significantly increases thermal retention compared to standard 3-season sleeping bags.

For serious winter adventurers, this level of insulation is essential.

Expanded Pocket System

Expanded Foot Pocket Storage – Built-in storage space for added functionality.

Dedicated Storage Zone – Keep essentials organized and easy to access.

Compact Packing Design – Packs down neatly for travel and transport.

Smart Space Utilization – Maximizes function without added bulk.

Anti-Snag Zipper

Anti-Snag Zipper – Designed for smooth and frustration-free operation.

Smooth Zip Performance – Helps reduce fabric catching while opening or closing.

Easy Entry Design – Built for quick access and effortless use.

Reliable Zipper System – Engineered for smoother everyday performance.

Snag-Resistant Design – Helps keep fabric from getting caught.

Hassle-Free Access – Smooth operation for getting in and out with ease.

Inner Sleeping Bag Pocket

Interior Storage Pocket – Keep small essentials secure and within reach.

Quick Access Storage – Convenient interior pocket for grab-and-go items.

Secure Interior Pocket – Designed to keep valuables close while you rest.

Organized Bedside Storage – Store essentials without leaving the sleeping bag.

Easy-Reach Pocket Design – Keeps important items nearby and easy to find.

Convenient Gear Storage – Perfect for phones, flashlights, and small essentials.

Built for the Journey Ahead

Adventure-Ready Comfort – Built for dependable sleep wherever the trail leads.

Warmth When It Matters – Designed to help keep you comfortable through the night.

Compact Travel Design – Packs down easily for transport and storage.

Outdoor-Ready Performance – Made for campsites, trails, and weekend escapes.