Top 5 Ultralight Winter Sleeping Bags of 2023

Close-up of a hiker sleeping in their tent in a warm ultralight winter sleeping bag

In this post, we'll take a look at:

When picking a lightweight winter sleeping bag, there are important things to think about. These include how cold it can handle, the kind of insulation (fluff or synthetic), how heavy and easy to carry it is, and if it’s good quality.

If you don’t consider these, you might end up with a bag that’s not warm enough or too heavy, making you uncomfortable during winter nights.

Our TOP 5 guide will help you choose the right one and make the best decision.

Top Ultralight Winter Sleeping Bag Picks

  1. Most Ultralight: Sierra Designs Nitro 0° (2lb 8.2oz/1140g)
  2. Best Overall: Nemo Sonic Down Sleeping Bag (3lb 3.8oz/1470g)
  3. Best Value: Thermarest Questar 0F Down Sleeping Bag (2lb 13.5oz/1290g)
  4. Warm Option: RAB Andes Infinium 800 Down Sleeping Bag (2lb 15.6oz/1350g)
  5. Budget Option: Mountain Hardwear Bishop Pass 0F (3lb 2oz/1420g)

1. Most Ultralight
Sierra Designs Nitro 0°

Ultralight Winter Sleeping Bag: Sierra Designs Nitro 0°

Key Specs

Weight: 2lb 8.2 ounces (1140 grams)
Limit Temp Rating: 0ºF | -17.7ºC
Price: $


✅ Ultralight

✅ Good for damp nights


❌ Zipper is a bit tricky

The Nitro 0 sleeping bag from Sierra Designs offers a lightweight and comfortable choice for winter backpacking. Its smart design, using durable materials and hydrophobic insulation, keeps you warm even on damp nights.

The mummy shape and draft collar help trap heat effectively, while the self-sealing foot vent provides relief to warm sleepers. The slightly roomier fit and efficient insulation make it a solid pick, although some users found the zipper a bit tricky.

Overall, the Nitro 0 is a dependable and reasonably priced option for cold weather adventures.

2. Best Overall
Nemo Sonic Down Sleeping Bag

Ultralight Winter Sleeping Bag: Nemo Sonic Down Sleeping Bag

Key Specs

Weight: 3lb 3.8 ounces (1470 grams)
Limit Temp Rating: 0ºF | -17.7ºC
Price: $$$


✅ -20ºF option available

✅ Great warranty


❌ Relatively heavy

The Nemo Sonic ultralight winter sleeping bag offers remarkable warmth and adaptability for a range of temperatures. This backpacker-approved bag comes with innovative features like Thermo Gill vents and recycled materials.

We can highlight its ability to handle even frigid conditions comfortably, allowing for a good night’s sleep in spacious comfort. The bag’s smart design, quick-drying insulation, and thoughtful details like a convenient pocket make it a reliable choice for extreme weather conditions.

3. Best Value
Thermarest Questar 0F Down Sleeping Bag

Ultralight Winter Sleeping Bag: Thermarest Questar 0F Down Sleeping Bag

Key Specs

Weight: 2lb 13.5 ounces (1290 grams)
Limit Temp Rating: 0ºF | -17.7ºC
Price: $$


✅ Hydrophobic down

✅ Small pack size


❌ Lacking toe box ventilation

The Thermarest Questar 0F/-18C ultralight winter sleeping bag offers comfort and practicality for cold outdoor conditions. Packed with Thermarest’s signature features, it’s designed to be used with your sleeping pad, providing warmth where you need it most.

Stuffed with water-resistant fill, this winter bag is prepared for any ultralight adventure. Available in different sizes for both men and women, it comes with compression and storage sacks.

While we’d wish for increased ventilation on warmer nights, the Questar remains a solid choice for tackling cold weather challenges.

4. Warm Option
RAB Andes Infinium 800 Down Sleeping Bag

Ultralight Winter Sleeping Bag: RAB Andes Infinium 800 Down Sleeping Bag

Key Specs

Weight: 2lb 13.5 ounces (1350 grams)
Limit Temp Rating: -2°F | -19°C
Price: $$$


✅ Warm option

✅ Small pack size


❌ Relatively expensive

The Rab Andes Infinium ultralight winter sleeping bag shines in extreme cold. With 800FP goose down and heat-reflective TILT tech, along with a GORE-TEX INFINIUM WINDSTOPPER outer, it offers remarkable warmth without bulk. The trapezoid baffles prevent cold spots and enhance insulation.

Based on our experience, this bag performs exceptionally well, exceeding expectations even in challenging conditions. It has been tested in sub-zero temperatures with frost inside the tent and has proven efficient at dissipating condensation while maintaining warmth. The interior lining adds to its comfort and insulation, ensuring comfort in harsh conditions.

Overall, the Rab Andes Infinium proves its effectiveness and quality, making it a dependable choice for cold weather adventures, despite its relatively higher cost.

5. Budget Option
Mountain Hardwear Bishop Pass 0F

Ultralight Winter Sleeping Bag: Mountain Hardwear Bishop Pass 0F

Key Specs

Weight: 3lb 2 ounces (1420 grams)
Limit Temp Rating: 0°F | -17.7°C
Price: $


✅ Good quality

✅ Relatively affordable


❌ Relatively heavy

❌ Large pack size

The Mountain Hardwear Bishop Pass winter sleeping bag is designed for versatile use by campers and climbers.

We can confirm its warmth, especially in freezing temperatures, and its roominess compared to other mummy-style bags.

While the sturdy zipper and functional hood are positive features, we discovered that the bag is bulkier than anticipated for longer ultralight trips.

Overall its a good budget option.

How to Select the Right Winter Sleeping Bag

Finding the right sleeping bag for winter camping starts with understanding key specifications that impact performance, weight and price. Let’s break it down:

  1. Temperature Rating: This number indicates the coldest weather a bag is designed to handle. For most winter campers, choose a limit temperature rating under 15 degrees Fahrenheit. To understand temperature ratings in more detail, check out our post here.
  2. Fill Material: Down or synthetic. High quality down is warmer for its weight but loses insulation if wet. Synthetics resist moisture better and dry quicker.
  3. Fill Weight: More down or synthetic fill means more insulation and warmth but also more weight to carry. Find the right balance for your needs.
  4. Shell and Lining: Get a bag with a durable, water-resistant outer shell and a softer inner lining for comfort.
  5. Features: Draft tubes, shoulder baffles and neck draft collars prevent body heat from escaping through gaps.
  6. Shape and Size: Get a bag suited for your body type and sleeping habits. Mummy bags are thermally efficient but restrictive. Rectangular bags allow more room to move.

Evaluating each specification will lead you to a winter sleeping bag retaining warmth while fitting your budget, performance preferences and tolerance for carrying weight into the cold backcountry.

If you’re unsure whether to choose a winter quilt or a sleeping bag, we recommend checking out our detailed post on the matter here.

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