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Rab

Rab Ascent -12°C Down Sleeping Bag – Cold Weather Backpacking Comfort

Rab Ascent -12°C Down Sleeping Bag – Cold Weather Backpacking Comfort

Regular price $475.00 CAD
Regular price Sale price $475.00 CAD
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-12°C Temperature Rating • 650FP Down Insulation • Spacious Comfort Fit

Sleep warm and comfortably in cold conditions with the Rab Ascent -12°C Down Sleeping Bag, a high-performance sleeping bag designed for backpacking, trekking, and winter camping. Built with premium down insulation and a more generous fit than traditional mummy bags, it offers a perfect balance of warmth, comfort, and durability for demanding outdoor adventures.

❄️ Reliable Warmth for Cold Conditions

Designed for colder climates, the Ascent -12°C delivers dependable insulation for winter and shoulder-season use.

  • Comfortable performance in sub-zero conditions
  • Ideal for cold-weather trekking and camping
  • Suitable for mountain and alpine environments

The Ascent range is known for versatility and reliability across a wide range of outdoor conditions.

🪶 650 Fill Power Down Insulation

Filled with 650FP European duck down, this sleeping bag offers excellent warmth while remaining relatively packable.

  • Strong warmth-to-weight ratio
  • Hydrophobic down helps resist moisture and maintain loft
  • Efficient insulation for cold-weather use

This makes it a great choice for adventurers who want dependable warmth without the bulk of expedition-level bags.

🛏️ Spacious Comfort Fit Design

Unlike tight alpine bags, the Ascent features a wide mummy shape, giving you more room to move while still retaining heat.

  • Comfortable for side sleepers and relaxed campers
  • Extra space for layering in colder conditions
  • Less restrictive than traditional mummy bags

Perfect for those who prioritize comfort without sacrificing thermal efficiency.

🔥 Advanced Baffle Construction for Even Warmth

The Ascent uses L.O.F.T™ baffle construction, helping maintain even insulation distribution.

  • Reduces cold spots and down migration
  • Improves loft and heat retention
  • Enhances overall sleeping comfort

🌧️ Durable & Weather-Resistant Materials

Built with Pertex® Quantum ripstop fabric, the Ascent is designed for real-world outdoor use.

  • Wind-resistant outer shell
  • Lightweight yet durable construction
  • Fluorocarbon-free DWR finish for moisture resistance

🎒 Packable & Adventure-Ready

Despite its warmth, the Ascent remains practical for travel and backpacking.

  • Packs down efficiently with included compression sack
  • Designed for multi-day trekking and camping trips
  • Durable enough for repeated use

🌄 Perfect For

The Rab Ascent -12°C Sleeping Bag is ideal for:

✔ Winter camping & cold-weather trips
✔ Backpacking and trekking
✔ Alpine and mountain environments
✔ Campers wanting comfort + warmth + durability
✔ Outdoor users who prefer a roomier sleeping bag fit

⚡ Why You’ll Love It

✔ Excellent balance of warmth, comfort, and durability
✔ Spacious design for a better night’s sleep
✔ Reliable down insulation for cold conditions
✔ High-quality materials built for long-term use
✔ Great all-around cold-weather sleeping bag

🔥 Stay warm and sleep comfortably in colder conditions with the Rab Ascent -12°C — a dependable down sleeping bag built for real-world adventures and long nights outdoors.

Features

Looking for a sleeping bag that prioritises warmth, comfort, and practicality? That will give you an easy night’s rest in the wild, without compromising on weight or pack size? This robust, reliable down-filled bag offers the versatility you need for regular mountain use. Armed with 650FP duck down, a spacious wide mummy shape, windproof Pertex® Quantum fabric, and a clever baffle construction that maximises warmth for weight, it's perfect for trekking and backpacking adventures.

Hand-filled in the UK, all our down bags benefit from never having had their down compressed before use, preserving its loft and warmth.

L.O.F.T construction uses alternating wide and narrow baffles to achieve great warmth for weight.
Sleep comfortably on your side thanks to the sidewall baffles, which reduce cold spots and ensure you’re not lying on a seam.

A second shorter zip with integrated snap closure allows you to use your arms while retaining heat in your sleeping bag, ideal for cooking in the cold.

Cinch in the hood to seal in the heat, while the synthetic insulated collar sits snugly around your neck.
Sleep in a relaxed, comfortable position thanks to the roomy, anatomically shaped foot box.

Keep valuables and essentials close at hand with a zipped internal stash pocket.

Wide mummy fit gives space for extra layers when night temperatures plummet.

Internal cordlocks positioned below your collar bone for greater side sleeping comfort.

Two-way YKK ¾ length main zip with synthetic-filled baffle.

YKK anti-snag zip insert and anti-snag internal zip guard.
Drawcord stuff sack included.

Zipped storage sack with water-resistant base for home storage.

Hand-filled in Derbyshire UK.

Specifications

Weight: 1350g/2lb 15.62oz

Insulation: 650FP European duck down with Grangers fluorocarbon-free hydrophobic finish (680g / 24.0oz)
Main fabric

20D Pertex Quantum nylon ripstop (38g/m²) with fluorocarbon-free DWR

Fabric lining: Lining: Recycled 20D nylon, 38g/m²

ISO (23537-2:2022) temperature rating:
- Comfort: -5°C (23°F)
- Limit of comfort: -12°C (10°F)
- Extreme: -33°C (-27°F)

Packed size: 22cm x 40cm (8.7in x 15.8in)

Product code: QSN-03

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