Choosing the right sleeping bag can make or break your outdoor adventure. This year, we've reviewed dozens of models to bring you the top three best sleeping bags of 2021, catering to a range of budgets and backpacking styles. From budget-friendly options perfect for comfortable camping to ultralight designs for serious hikers prioritizing minimal weight, we've got you covered. This detailed review will delve into the key features, performance, and pricing of each bag, helping you make an informed decision based on your specific needs.Our rigorous testing considered factors like weight, warmth, price, and overall comfort. We've ranked the Kelty Cosmic, REI Co-op Magma, and Hummingbird YF sleeping bags, providing a comprehensive comparison to guide you towards the perfect sleeping companion for your next adventure. Whether you're a seasoned backpacker or just starting out, this guide will help you find the ideal balance between warmth, weight, and affordability.
Pros And Cons
- Lightweight (around 3 pounds)
- Temperature rating of around 21 degrees
- Very lightweight (around 1 pound 6 ounces)
- Temperature rating of about 30 degrees
- Lightweight (about 1 pound 10 ounces)
- Temperature rating of about 20 degrees
Read more: Best Mummy Camping Sleeping Bags: Top 5 Picks
Kelty Cosmic: A Budget-Friendly Backpacking Option
The Kelty Cosmic sleeping bag secured the number three spot on our list. It's a fantastic choice for backpackers, boasting a lightweight design at approximately three pounds. This makes it ideal for carrying on long treks without weighing you down excessively.

Despite its lightweight nature, the Kelty Cosmic still provides reliable warmth down to about 21 degrees Fahrenheit. This means it can handle chilly nights just below freezing temperatures, offering a good balance of warmth and portability.

Currently, you can find the smallest size for around $130, while the largest size retails for about $150. This makes it a very affordable option compared to other bags on the market, especially considering its performance and features.
REI Co-op Magma: Lightweight and Warm
Coming in at number two is the REI Co-op Magma. This sleeping bag stands out for its incredibly light weight, clocking in at a mere one pound six ounces. This makes it perfect for ultralight backpacking or anyone who prioritizes minimal weight.

Despite its featherlight design, the REI Co-op Magma maintains a respectable temperature rating of around 30 degrees Fahrenheit. This impressive warmth-to-weight ratio ensures comfort even on relatively cool nights.

The REI Co-op Magma, however, carries a higher price tag, currently retailing at approximately $340. While more expensive than the Kelty Cosmic, the superior weight-to-warmth ratio makes it a compelling choice for serious ultralight backpackers.
Hummingbird YF: Top-Tier Goose Down Comfort
Our top pick is the Hummingbird YF sleeping bag. This premium goose down sleeping bag offers exceptional warmth and comfort. Weighing in at around one pound ten ounces, it strikes an excellent balance between weight and insulation.

The Hummingbird YF boasts an impressive temperature rating of approximately 20 degrees Fahrenheit. This guarantees exceptional warmth even in frigid conditions. It's a top choice for those prioritizing warmth and comfort, even at higher altitudes or in very cold climates.

The Hummingbird YF, however, comes with a premium price point, currently around $470. While the highest priced of the three, the exceptional quality, warmth, and lightweight design make it a worthwhile investment for serious outdoor enthusiasts.
Conclusion: Choosing the Right Sleeping Bag
The best sleeping bag for you ultimately depends on your individual needs and budget. The Kelty Cosmic offers an affordable and practical option for backpackers who prioritize value. The REI Co-op Magma excels in ultralight backpacking due to its incredibly low weight without sacrificing too much warmth.
The Hummingbird YF is the top choice for those who demand premium comfort and warmth, even in extreme cold. Its higher price tag is justified by its superior quality and performance. Consider your priorities - budget, weight, and warmth - to select the sleeping bag best suited for your adventures.