Best winter synthetic sleeping bag – top 5 picks for lightweight warmth in 2021

Our round up of the best winter synthetic sleeping bags

best winter synthetic sleeping bag

The cold winter months are coming up and it’s time to get your gear in order.

One crucial piece of camping equipment is the sleeping bag, but what kind should you get?

There are a few different types of synthetic sleeping bags out there for various budgets and needs.

In this article, we’ll take a look at which ones you might want to consider when buying one.

In a hurry? Here are our top 3 picks for best winter synthetic sleeping bag.

Big Agnes Lost Dog 0°F Sleeping Bag

Best all-round winter synthetic sleeping bag

  • 100% consumer recycled FireLine ECO Synthetic Insulation
  • size: fits campers up to 6’6″; Fits a 20″-25″ wide x 78” long pad
  • weight: 4 lbs. 10 oz
  • compression sack supplied

Big Agnes Sunbeam 0°F Sleeping Bag

Best winter synthetic sleeping bag for women

  • 100% post-consumer recycled FireLine ECO Synthetic Insulation
  • size: fits campers up to 5′ 10″; Fits a 20″-25″ wide x 72” long pad
  • weight: 4 lb. 6 oz
  • compression sack supplied

Coleman 0°F Mummy Sleeping Bag

Best budget winter synthetic sleeping bag

  • synthetic fill – polyester
  • size: 32″ x 82″
  • stuff sack included
  • weight: 5.8lbs


What is the warmest synthetic sleeping bag?

The warmest synthetic sleeping bag is the Big Agnes Lost Dog 0°F.

We’ve featured it in the list below for detailed information on it.

You’ll often find that synthetic sleeping bags don’t have as much of a lower temperature rating than naturally down filled sleeping bags.

  • Synthetic sleeping bags are made from a synthetic material that is designed to keep you warm
  • There are many different types of synthetic materials, but the two main ones used in sleeping bags are polyester and nylon
  • The warmth of a sleeping bag depends on its fill power
  • Fill power determines how much space is taken up by the insulation
  • A higher fill power means more loft or thickness for your sleeping bag which will make it warmer than one with a lower fill power
  • In general, down-filled bags have a higher fill power than those filled with synthetics because they use feathers as their filling material instead of man-made fibers

Best winter synthetic sleeping bag

1. Coleman 0°F Mummy Sleeping Bag

Coleman 0°F Mummy Sleeping Bag

A budget, synthetic sleeping bag made for temperatures down to 0°F


  • synthetic fill – polyester
  • size: 32″ x 82″
  • stuff sack included
  • weight: 5.8lbs

The Coleman 0°F mummy sleeping bag is perfect for camping in cooler temperatures.

It features a semi-sculpted hood that can be cinched at your neck to seal in warmth, an insulated foot box to keep cold from seeping through to your feet, and a thermolock draft tube that escapes heat outward so you stay warm throughout the night.

The sleeping bag comes with a stuff sack for quick and easy packing away. The only problem is that the stuff sack was designed for easy packing and is a little larger than it needs to be.

This is only a problem if you plan to use it when going backpacking as it will add unnecessary bulk to what you need to carry on your back.

While it’s the most budget option on this list, it will keep you cozy and warm when the temperature goes down.

Check current price on Amazon


2. The North Face Cat’s Meow 20°F Sleeping Bag

The North Face Cat's Meow Synthetic Winter Sleeping Bag

An eco-friendly, super warm synthetic sleeping bag for winter temperatures


  • 50% post-consumer recycled Heatseeker synthetic insulation
  • lightweight
  • stuff sack included
  • plenty of size options to suit all heights and sizes
  • weight: 2 lbs 1 oz (circa depending on size)
  • plenty of size options to suit all heights and sizes

Keep your tootsies warm with this cozy Cat’s Meow 20°F Sleeping Bag.

The durable, water-resistant outer shell and liner keep the cold out when it gets chilly, while a soft microfleece lining helps you stay comfy and cozy inside.

No need to worry about drafts: this baby’s got a fitted hood, draft collar, and zipper baffle for increased comfort and warmth.

And if that wasn’t enough, keep one foot underfoot with an elevated vaulted foot box that gives extra loft.

Traveling solo or backpacking with friends? This is the sleeping bag for you. It’s lightweight and super quick to pack, making it perfect for those last-minute weekend adventures that leave less time than you’d like to cram good sleep into hectic days.

The Cat’s Meow also uses synthetics fibers made from recycled materials, making it an environmentally friendly option (cool!).

Check current price on Amazon


3. TETON Sports Altos 0°F Sleeping Bag

TETON Sports Altos Synthetic Winter Sleeping Bag

Triple-washed, soft and cozy camping blanket


  • synthetic fill and outer
  • stuff sack included
  • size: 84″ x 32″
  • weight: 3.5lbs

TETON’s ultralight, roomy Altos 0°F sleeping bag is the perfect way to stay warm on a winter camping trip.

It provides more shoulder and legroom for comfort and the 3-piece hood means you won’t have to worry about trying to tie down your hat to keep warm.

This sleeping bag has been made with comfort in mind, it features a vaulted foot box so you can feel your toes no matter what position you sleep in.

Not only all of this but it also comes with zipper draft tubes that prevent any air from coming inside the bag while it’s being zipped up.

The lofty design will make you feel like you’re camping out in your own bed.

Whether you’re trekking around Yosemite or spending winter at home, this water-resistant sleeping bag will keep you nice and cozy.

The included compression sack makes packing it away as easy as 1, 2, 3. It packs down to a tiny size for easy carrying when backpacking or hiking.

With its durable fabric and sustainable, synthetic fill, it’s hard to find a better bag at this price.

Check current price on Amazon


4. Big Agnes Lost Dog 0°F Sleeping Bag

Big Agnes Lost Dog Synthetic Winter Sleeping Bag

Eco-friendly, synthetic sleeping bag with sleeping pad system


  • 100% consumer recycled FireLine ECO Synthetic Insulation
  • size: fits campers up to 6’6″; Fits a 20″-25″ wide x 78” long pad
  • weight: 4 lbs. 10 oz
  • compression sack supplied

Big Agnes’ Lost Dog 0°F Sleeping Bag is the perfect winter accessory for campers and outdoor enthusiasts.

Outfitted with everything you need for a plush experience in the coldest of climates or just winter nights, the 0°F Lost Dog Sleep System Bag will keep you warm all night long.

It’s not just a bag, it’s a sleep system that attaches right to your sleep pad for maximum comfort and no slippery sliding off of your sleeping pad during the night.

Its innovative design also eliminates cold spots on your pad thanks to special baffles that help keep heat inside of the sleeping bag near your body.

Now you can control the temperature totally, all with this one easy-to-carry soft synthetic insulation piece!

Check current price on Amazon


5. Big Agnes Sunbeam 0°F Sleeping Bag

Big Agnes Sunbeam Synthetic Winter Sleeping Bag

Integrated sleep system sleeping bag designed for women


  • 100% post-consumer recycled FireLine ECO Synthetic Insulation
  • size: fits campers up to 5′ 10″; Fits a 20″-25″ wide x 72” long pad
  • weight: 4 lb. 6 oz
  • compression sack supplied

When it comes to warmth, there’s no better name than Big Agnes.

That’s if you couldn’t already tell from how many of their sleeping bags have made the list.

The Big Agnes Sunbeam 0 Sleeping Bag is the perfect bag for when you want to sleep out in the wilderness with all your favorite memories.

The tailored fit provides lots of shoulder room, and also keeps your pillow nicely tucked in tight so that even if you toss and turn at night it won’t get scooted too far away.

With two-way zippers, you can open up this sleeping bag fully, sleep with it just half way unzipped, or zip yourself completely closed so there are tons of ways to get this thing adjusted to your liking—so no matter what mood strikes you while camping away from society’s luxuries, you can ensure you have a warm and comfy nights sleep.

Check current price on Amazon


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