---
title: "Cumulus Alaska 900"
name: "Cumulus Alaska 900"
brand: "Cumulus"
description: "Are you looking for an affordable winter sleeping bag that won't take up half your backpack and won't weigh you down?"
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price: 413.7
price_formatted: "€413.70"
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  - name: "Cumulus Alaska 900"
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last_updated: "2026-10-13"
---

# Cumulus Alaska 900

Brand: Cumulus · Category: [Sleeping bags](/c/sleep/sleeping-bags.md)
Sleeping bag size: L, M, S · Zip position: Left side, Right side · Zipper position: Left, Right

## Offer

- Price: €413.70
- Availability: In stock
- Condition: New
- Buy on the website: [HTML product page](/p/cumulus-alaska-900)

## Description

Are you looking for an affordable winter sleeping bag that won't take up half your backpack and won't weigh you down? With the Cumulus Alaska 900 sleeping bag, you can't go wrong. Thanks to high-quality materials, DWR treatment of the outer fabric, and a well-designed construction, it provides an excellent balance of thermal comfort to weight.

Well-designed down sleeping bag with more durable fabric for freezing adventures.

## Materials

The manufacturer has opted for the already proven ultralight fabric **Pertex® Quantum 35 g/m²** (20-denier ripstop), which perfectly combines high durability, breathability, and packability. On the outer side, the fabric is equipped with a **permanent water-repellent DWR coating** that will hold back light condensation or a few drops of water.

The sleeping bag is filled with **900 grams of white duck down with a fill power of 700 cuin**. The down-to-feather ratio is 95/5. The upper chambers are separated from the lower ones and are filled with a slightly larger amount of down. The down is distributed here in a ratio of 55/45.

## Construction

The sleeping bag **double H-shaped chamber design**. It is one of the most advanced types of chambers that minimizes the formation of so-called cold spots at the seam between chambers. At the same time, it has a relatively low weight.

The width of the sleeping bag at the shoulders is 85 cm and at the hips is 59 cm. Based on our experience, the basic size M is suitable for individuals with a maximum height of 190 cm.

## Features

For simple orientation, the drawstring for the hood and collar is differentiated; you tighten the hood with a flat strap and the collar with a rubber band. The sleeping bag has a **fluffy down collar that wraps around your neck** from both sides and prevents heat loss through the hood. Inside the sleeping bag, there is a mesh pocket for your mobile phone, earplugs, or other small items.

The sleeping bag has a YKK zipper with an extended slider to prevent it from getting caught in the fabric when zipping up. At the feet, you'll find a second slider, which is ideal for ventilation. Behind the zipper on the inside are **two down-filled insulating tubes**, which minimize heat loss through the zipper itself. Two sleeping bags from the brand Cumulus with **opposite zippers (left + right) can be zipped together**.

## Sleeping bag accessories

**A simple travel storage sack is included with the sleeping bag.** The sleeping bag has the shape of a cylinder with a volume of 14,1 liters and dimensions of 32/21 cm (height/diameter).

The original sack cannot be further compressed and is not waterproof, so we recommend getting a sack that solves both problems. The ideal choice is [STS compression sack eVENT Ultra-Sil](/p/sea-to-summit-evac-compression-dry-bag-ul) of size L or a classic waterproof bag [Sea To Summit Ultra-Sil Dry Sack](/p/sea-to-summit-ultra-sil-dry-bag) about the size of 20 liters.

**You also get a large storage bag for home use** with the sleeping bag, so the sleeping bag isn't unnecessarily compressed for a long time.

## Specs

- Color: Jadewood
- Sleeping bag size: L, M, S
- Zip position: Left side, Right side
- Zipper position: Left, Right
- Chamber design: H-shaped chambers
- Down-to-feather ratio: 95/5 (feather/down)
- Filling chambers: 55:45
- Total number of chambers: 37
- Extreme temperature: -39 °C
- Comfort temperature: -10 °C
- Limit temperature: -18 °C
- Down weight: 900 g
- Fill power: 700 cuin
- Down type: Duck
- Hydrophobic down: No
- Insulation type: Down
- Material: YKK 5 mm zip, Pertex Quantum DWR (35 g/m², 20D ripstop nylon)
- Packed dimensions: 34-x-21 cm
- Stuff sack volume: 11.8 l
- Hip width: 59 cm
- Shoulder width: 85 cm
- Weight: 1400 g
- Woocommerce product id: 24509
- Brand: Cumulus

## Variants

- Cumulus Alaska 900 - L, levá strana · SKU CUAL900-LL · €498.20 · Out of stock · Left side, Jadewood, L
- Cumulus Alaska 900 - S, levá strana · SKU CUAL900-SL · €464.40 · Out of stock · S, Left side, Jadewood
- Cumulus Alaska 900 - M, pravá strana · SKU CUAL900-MP · €413.70 · In stock · Jadewood, M, Right side
- Cumulus Alaska 900 - M, levá strana · SKU CUAL900-ML · €413.70 · In stock · Left side, Jadewood, M

## Related

- [Patizon G 800](/p/patizon-g800.md)
- [Sea To Summit eVac Compression Dry Bag](/p/sea-to-summit-evac-compression-dry-bag.md)
- [Patizon G 1100](/p/patizon-g1100.md)
- [Sea To Summit Lightweight Dry Bag](/p/sea-to-summit-lightweight-dry-bag.md)
- [Cumulus Panyam 600](/p/cumulus-panyam-600.md)
- [Sea To Summit Ultra-Sil Dry Bag](/p/sea-to-summit-ultra-sil-dry-bag.md)
- [Cumulus Teneqa 850](/p/cumulus-teneqa-850.md)
- [NEMO Switchback](/p/nemo-switchback.md)

## Shipping and returns

- [Shipping and payment](/shipping-payment)
- [Returns](/return-order)

## Images

- ![Cumulus Alaska 900](https://media.gramino.com/medusa/48f09380f1f8b35f5e0447ccadc647ff-01KWHVP1Y5TCME8J95MSG6BXQG.webp)
- ![Cumulus Alaska 900](https://media.gramino.com/medusa/7ae71410de7537801110e2641f78d213-01KWHVP1ZQ9V0XBX2P8ZRBA397.webp)
- ![Cumulus Alaska 900](https://media.gramino.com/medusa/9191a967d00dffa55752b4de97e98b75-01KWHVP23HVB64NHD91P3V9PB1.webp)
- ![Cumulus Alaska 900](https://media.gramino.com/medusa/7f494df58536a46eae4ae07003e1b636-01KWHVP257SVZPWYWAQYRGZ57N.webp)
- ![Cumulus Alaska 900](https://media.gramino.com/medusa/5a3d6abf1a6efd1ef316eaf641a478b2-01KWHVP25586FV57E6RT5HTZ4Y.webp)
- ![Cumulus Alaska 900](https://media.gramino.com/medusa/224d253bc68a213fc191ef3df9f4abf0-01KWHVP24CCTGQKR325RE5Q5Q9.webp)
- ![Cumulus Alaska 900](https://media.gramino.com/medusa/fa3fcb91c5d01f25bb40649704fb3d15-01KWHVP23PN6FQWXD5RY70XMMW.webp)

## Identifiers

- SKU: CUAL900-MP
- Handle: cumulus-alaska-900
- Brand: Cumulus

This product is also available as [HTML](/p/cumulus-alaska-900).

Category: [Sleeping bags](/c/sleep/sleeping-bags.md) · [Sitemap](/sitemap.md)

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