---
product_id: 62810780
title: "Fjellduken Extreme Mountain Bivvy Bag"
brand: "jerven"
price: "A$70"
currency: AUD
in_stock: false
url: https://www.desertcart.com.au/products/62810780-fjellduken-extreme-mountain-bivvy-bag
store_origin: AU
region: Australia
---

# Waterproof aluminium-coated outer 220 cm length for extra legroom PrimaLoft 170g/m² insulation Fjellduken Extreme Mountain Bivvy Bag

**Brand:** jerven
**Price:** A$70
**Availability:** ❌ Out of Stock

## Summary

> ❄️ Stay warm, stay wild — conquer the extremes with Fjellduken!

## Quick Answers

- **What is this?** Fjellduken Extreme Mountain Bivvy Bag by jerven
- **How much does it cost?** A$70 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/62810780-fjellduken-extreme-mountain-bivvy-bag)

## Best For

- jerven enthusiasts

## Why This Product

- Trusted jerven brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Arctic-Grade Warmth:** Reflective aluminium coating traps body heat, proven to raise internal temps by up to 29°C in subzero conditions.
- • **Generous Dimensions:** Spacious 204 x 220 cm fully opened size offers unmatched comfort and mobility for year-round use.
- • **Compact & Lightweight:** Folds down to a portable 50 x 20 cm at just over 2 kg—carry premium protection without bulk.
- • **Versatile 6-in-1 Design:** Transforms effortlessly from bivvy bag to poncho, tarp, hammock, or sleeping bag cover—adapt to any adventure.
- • **Military-Tested Durability:** Trusted by the Norwegian Army since 1983 for rugged mountain conditions—built to last and perform.

## Overview

The Jerven Fjellduken Extreme Mountain Bivvy Bag is a military-grade, multi-functional thermal shelter featuring PrimaLoft insulation and a waterproof aluminium-coated outer layer. Measuring 204 x 220 cm when opened, it offers exceptional warmth and versatility for year-round mountain use. Proven to maintain a 29°C temperature difference in freezing tests, it’s trusted by the Norwegian Army and designed for professionals who demand reliable, compact, and adaptable outdoor protection.

## Description

The Jerven Fjellduken Extreme was developed at the request of the Norwegian armed forces - a wind protection that is warm enough in winter to replace a sleeping bag. The same outer fabric as the Fjellduken original, only with PrimaLoft 170 g/m² filling. With a length of 220 cm, Jerven Fjellduken Extreme offers more space and leg room than the original and the thermo The wind deflector measures 102 x 220 cm. The outer material of the Fjellduken is fully aluminium coated and waterproof on the inside. Thanks to the aluminium coating, the heat is reflected back and kept in the insulation, just like a rescue blanket. The zippers open on both sides, sleeve openings and reinforced eyelets offer a variety of uses. So it can be used as a poncho, tarp, sleeping bag, sleeping bag cover, bean bag and even as a hammock. During tests by the Oulo Regional Institute in winter, at an outdoor temperature of -14°C, the temperature inside the closed Jerven Fjellduken Thermo was +15°C - a temperature difference of 29°C. The only source of heat was the person inside the bivvy bag. The Jerven Fjellduken Original achieved a temperature difference of 9°C in the same test. What is "Fjellduken"? In Norway, the invention is generally known as "Fjellduken" or "Jervenduken". Primarily it was designed as a wind and waterproof poncho/wind protection for hunters, but can also be used as a temporary bivouac or flexible tent tarp. The Jerven bivvy bag can protect both one person and the backpack from rain and cold. It can be opened up as a roof construction for a whole group or used as a sleeping bag or cover for the sleeping bag. Thanks to its versatility and thoughtful design, the Jerven bivvy bag can be used just as it is needed.

## Features

- The Jerven Fjellduken Extreme is a universal, extra thick lined thermal bivvy bag for year-round use.
- Dimensions (fully opened): approx. 204 x 220 cm. Dimensions (folded): approx. 102 x 220 cm. Pack size: approx. 50 x 20 cm. Weight: approx. 2065g
- The Jerven Fjellduken has been successfully used in the Norwegian Army since 1983. The unique Jerven Mountain camouflage is perfect for mountain landscapes, which is why the Jerven Fjellduken now also in other European mountains.
- Outer material: 100% polyester (coated). Inner lining: 100% polyamide (PrimaLoft 170g/m²). Padding: 100% polyester.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Color | Mountain |
| Brand | Jerven |
| Manufacturer | Jerven |
| Manufacturer reference | 1031 |
| ASIN | B071GQCRXR |

## Images

![Fjellduken Extreme Mountain Bivvy Bag - Image 1](https://m.media-amazon.com/images/I/71wTJa6Y+0L.jpg)
![Fjellduken Extreme Mountain Bivvy Bag - Image 2](https://m.media-amazon.com/images/I/81xwye2FCeL.jpg)
![Fjellduken Extreme Mountain Bivvy Bag - Image 3](https://m.media-amazon.com/images/I/81VI4jqepwL.jpg)
![Fjellduken Extreme Mountain Bivvy Bag - Image 4](https://m.media-amazon.com/images/I/617j3PUywxL.jpg)

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*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-03-08*