Top 5 Ultralight 4-Season Sleeping Bags of 2023

4-Season Sleeping Bags: Hiker enjoying tea in 4-season sleeping bag

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

When choosing an ultralight 4-season sleeping bag, remember to consider its warmth, weight, and durability. Check if it fits well, has useful features, and suits different situations.

Picking the wrong bag, however, could lead to discomfort, inadequate warmth, excessive sweating, restricted movement, and even potential dangers like getting too cold. So, making the right choice truly matters.

Nevertheless, there’s no need to worry – our guide can assist you in making the wisest decision for a comfortable and secure outdoor experience.

Top Ultralight 4-Season Sleeping Bag Picks

  1. Most Ultralight: Thermarest Hyperion 20F/-6C Sleeping Bag (1lb 3.6oz/566g)
  2. Best Overall: Sea to Summit Spark Ultralight Sleeping Bag (1lb 10oz/745g)
  3. Best Value: Mountain Hardware Bishop Pass (2lb 5.3oz/1060g)
  4. Best for Side Sleepers: NEMO Riff 15F Down Sleeping Bag (2lb 3.5oz/1008g)
  5. Budget Option: Sierra Designs Get Down 20° (2lb/930g)

1. Most Ultralight
Thermarest Hyperion 20F/-6C Sleeping Bag

Ultralight 4-Season Sleeping Bags: Thermarest Hyperion 20F/-6C Sleeping Bag

Key Specs

Weight: 1lb 3.6 ounces (566 grams)
Limit Temp Rating: 20ºF | -6ºC
Price: $$


✅ Ultralight

✅ Hydrophobic down


❌ Short zipper

The Hyperion 20F/-6C is made with careful attention to detail, perfect for lightweight backpacking without sacrificing warmth. Its clever box baffled design keeps you cozy and well-insulated.

Based on our experience, the bag is effective at keeping you warm. However, there’s a downside: the bag’s short zipper limits how versatile it is. You can’t open it up enough to use it like a blanket, which would be handy during nights that are warmer.

Besides that, the Hyperion is a fantastic choice for an ultralight 4-season sleeping bag.

2. Best Overall
Sea to Summit Spark Ultralight Sleeping Bag

Ultralight 4-Season Sleeping Bags: Sea to Summit Spark Ultralight Sleeping Bag

Key Specs

Weight: 1lb 10 ounces (745 grams)
Limit Temp Rating: 18ºF | -7.7ºC
Price: $$$


✅ Ultralight

✅ Good in warm and cold


❌ Zipper tends to catch

The Spark Ultralight sleeping bags are meticulously crafted with high-quality materials and a simple design, resulting in outstanding performance. They achieve a balance between snugness and allowing flexibility for movement.

Our findings indicate that these bags are not only lightweight but also provide coziness, proving their value in various weather conditions. However, we did encounter problems with the zipper, which tends to catch.

In conclusion, it’s a reliable overall choice for ultralight hikers who desire a combination of comfort, functionality, and a lightweight build.

3. Best Value
Mountain Hardware Bishop Pass

Ultralight 4-Season Sleeping Bags: Mountain Hardware Bishop Pass

Key Specs

Weight: 2lb 5.3 ounces (1060 grams)
Limit Temp Rating: 15ºF | -9ºC
Price: $$


✅ Comfortable

✅ Very warm


❌ Relatively heavy

The Bishop Pass sleeping bag from Mountain Hardwear is an ideal choice for ultralight hikers seeking versatility and performance. It boasts intelligent features such as a draft collar for comfort and a footbox designed to provide warmth and airflow, ensuring coziness on any adventure.

Notably, its details like the luminous zipper pull and thoughtful design are quite remarkable. Additionally, it receives praise for its comfort and effectiveness in cold weather.

4. Best for Side Sleepers
NEMO Riff 15F Down Sleeping Bag

Ultralight 4-Season Sleeping Bags: NEMO Riff 15F Down Sleeping Bag

Key Specs

Weight: 2lb 3.5 ounces (1008 grams)
Limit Temp Rating: 15°F | -9°C
Price: $$$


✅ Durable

✅ Great warranty


❌ A bit snug

The Riff sleeping bag from Nemo is a top-notch option crafted for ultralight hikers. Its distinct Ultralight Spoon shape accommodates side sleepers, providing additional space around the elbows and knees to ensure a comfortable night’s rest.

Packed with amenities like vents, a draft collar, and a waterproof footbox, this bag is fully equipped.

We can emphasize its warmth, excellent craftsmanship, and considerate features such as a cell phone pouch and pillow pouch.

Although some users might find it a bit snug, the overall comfort and advantages compensate for this minor drawback.

5. Budget Option
Sierra Designs Get Down 20°

Ultralight 4-Season Sleeping Bags: Sierra Designs Get Down 20°

Key Specs

Weight: 2lb (930 grams)
Limit Temp Rating: 17°F | -8.3°C
Price: $


✅ Very simple design

✅ Relatively affordable


❌ Not the warmest option

The Get Down 20 sleeping bag from Sierra Designs is a dependable option for ultralight hikers. With a robust 20-denier polyester shell and 550-fill DriDown insulation, it’s well-prepared for unexpected weather shifts.

Baffled construction erases cold spots, while practical features like interior hand pockets, an adjustable hood, and a draft collar ensure utmost warmth and comfort.

It’s worth noting that it’s smaller than other bags with similar temperature ratings. While it might not be suitable for extremely cold nights, it is still a great budget-friendly sleeping bag.

How to Select the Right 4-Season Sleeping Bag

Selecting the perfect 4-season backpacking sleeping bag is a vital decision for outdoor enthusiasts.

Ensuring a comfortable and warm night’s sleep while keeping the weight of your gear in check is essential for a great wilderness experience.

When choosing a sleeping bag, the temperature rating is a crucial factor; it’s advisable to opt for one rated a bit lower than the coldest expected conditions to stay cozy.

However, comfort depends not only on the bag but also on your entire sleep system, including the R-value of your sleeping pad.

Weight is another crucial consideration, influenced by insulation quality and bag design. The choice between down and synthetic insulation holds significance, as down is lightweight and compressible, while synthetic insulation maintains warmth when wet.

Additional features like hoods, draft-blocking mechanisms, and pocket options can further enhance your sleeping experience in the great outdoors.

The right sleeping bag is an investment in a comfortable and restful backpacking journey. If you want to find out more about sleeping bag temperature ratings, check out our post here. And if you’re curious about the differences between down and synthetic insulations, you can read our post here.

If you didn’t find the perfect sleeping bag in this guide or you think the temperature rating isn’t warm enough, don’t worry. You can improve your sleep system’s warmth by using a sleeping bag liner. Check out some of the lightest sleeping bag liners here.

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