Big Agnes Lost Ranger 3-in-1 Sleeping Bag

Editor choice Big Agnes Lost Ranger 3-in-1 Sleeping Bag

The Big Agnes Lost Ranger 3-in-1 Sleeping Bag is a three-in-one modular design comprised of two down-filled inner and outer sleeping bags. The sleep system offers customizable comfort for three-season camping, hiking, and a variety of other activities.


  • The Big Agnes Lost Ranger 3N1 features DownTek 650 fill down insulationInsotect Flow vertical baffles and PFC free water repellent finish.
  • The sleeping bag weighs 3 lbs, 12 oz (Regular Size – Left Zip), 4 lbs, 2 oz (Long Size – Left Zip), making it one of the lightest sleeping bags on the market.
  • The inner and outer bags may be used alone or in tandem, depending on your sleep style and preferred temperature.
  • A jacket-style hood is included within the bag to keep your head warm.
  • A no-draft collar, no-draft wedge, and two anti-snag dual side zippers with zipper garages are included on the outer bag.
  • The inner and outer bags are layered to increase internal warmth while reducing cold spots—this combination has a verified lower temperature limit of 15°F.
  • Optimized for side sleeping, with a 3/4-length anti-snag ambidextrous zipper.
  • The inner and outer bags have 2-way zippers on the top and bottom for easy temperature management.
  • Includes a hidden pillow barn to keep your pillow tucked in all night.
Big Agnes Lost Ranger 3-in-1 Sleeping Bag
Big Agnes Lost Ranger 3-in-1 Sleeping Bag


Lost Ranger 3n1 Sleeping Bag Pros and Cons


  • DownTek 650 fill power down insulation for reliable warmth.
  • Insotect Flow vertical baffles for a comfortable fit to keep you warm during cold nighttime temps.
  • PFC free, water-repellent finish to keep the sleeping bag dry in rain or moist conditions.
  • The inner bag design caters specifically towards side sleepers – offering additional coverage on the sides around your head and shoulders.
  • The entire sleep system weighs just 3 lbs 12 oz (regular size) and 4 lbs 2 oz (long size).
  • When compressed, the sleeping bag only takes up 16.3 liters (regular size) and 13.9 liters (long size).
  • The sleeping bag can attach directly onto a camping pad, ensure that you don’t slip around during your sleep.


  • The outer quilt bag of the Big Agnes Lost Ranger 3n1 sleeping bag may be difficult to get in and out of due to its design.
  • There may be fraying along seams after multiple uses or where straps are attached to material.
  • There could be inconsistencies in fabric tinting across different models and sizes.

Overview of Big Agnes Lost Ranger 3n1 Sleeping Bag

The Big Agnes Lost Ranger 3N1 0 Sleeping Bag is designed with a modular three-in-one system to provide superior comfort and warmth for 3-season camping and backpacking. The sleeping bag comes with an attached pad cord lock to securely attaches a sleeping pad.

Modular design with three configurations

The Lost Ranger 3N1 is truly unique in its versatile design and multiple configurations.

  • It features an inner bag with a temperature rating of approx. 20°F, and an outer bag with a temp rating of approx. 45°F
  • The inner and outer bags can be used separately, or combined together depending on the weather.
  • The modular design also makes it easy to attach another 3N1 sleeping bag for doublewide coverage.
  • The combination of the two bags provides maximum warmth and prevents cold spots by using offset quilting which ensures every inch of down gets evenly spread out.

Sleeping pad attachment

The Big Agnes Lost Ranger 3N1 Sleeping Bag comes with an attachment system that allows it to be connected securely onto a sleeping pad. This provides enhanced stability and prevents the sleeping bag from shifting during sleep, especially beneficial for restless sleepers or those who move around more often at night.

By attaching the bag to a pad, you get better insulation as well as ground protection since your body won’t have direct contact with the ground. The whole process of attaching this bag is also very easy and straightforward, allowing users to enjoy a comfortable and secure night’s sleep without worry or hassle.

Suitable for 3-season camping and backpacking

The Big Agnes Lost Ranger 3n1 offers you the versatility and adaptability to take on any outdoor adventure. Its modular design has three configurations that can be used together or separately for different purposes.

  • You get a full sleeping bag system with inner and outer bags, both of which are temperature rated down to about 20°F and 45°F respectively – perfect for camping during most 3-season months.
  • The innovative offset quilting in the combined setup helps minimize cold spots to ensure comfort at all temperatures.
  • In addition, its lightweight yet durable materials make this bag suitable for backpacking with ease!

Features and Technical Specs

The Lost Ranger 3n1 offers warm and comfort with its 800-fill down insulation, while remaining incredibly lightweight at only 1.5 lbs thanks to the 10D nylon materials used.

Materials used

The Big Agnes Lost Ranger 3N1 0 Sleeping Bag is crafted with quality and comfort in mind.

  • The bag features the use of 650-fill-power DownTek down for insulation, which helps provide maximum loft and warmth while being lightweight at the same time.
  • In addition, it has a water-repellent finish that is PFC-free to ensure durability without compromising your health or safety.
  • Furthermore, this sleeping bag also uses Global Recycling Standard certified 100% post-consumer recycled polyester taffeta lining for softness on skin contact and added insulation protection.

Weight and packability

The Big Agnes Lost Ranger 3N1 0 Sleeping Bag is designed to be light, while delivering maximum comfort.

  • It weighs 3lbs 12oz for the Regular – Left Zip size and 4lbs 2oz for the Long – Left Zip size, making it one of the lightest sleeping bags available with its superior luxurious feel and high-quality materials.
  • Additionally, its compressed volume can also fit into most backpacks measuring 16.3 liters for the Regular – Left Zip size and 13.9 liters for the Long – Left Zip size.

Packed size

The Big Agnes Lost Ranger 3N1 sleeping bag is packed into a relatively small size.

  • The compressed dimensions make the Lost Ranger 3N1 ideal for camping and backpacking, as it fits nicely into most backpacks without taking up too much space or adding unnecessary weight.
  • This also makes it easier to store when not in use, thanks to its compact design.

Similar Products from Big Agnes

Big Agnes offers a range of similar sleeping bag systems, including the Anvil Horn 0°, Diamond Park 0°, Lost Dog 0° and Lost Ranger UL 3N1 0°.

Anvil Horn 0°

Big Agnes’ award-winning Lost Ranger 3n1 sleeping bag is a great option for camping and backpacking in mild temperatures. It has three configurations that are designed to suit various seasonal camping needs — the Mummy, Semi rectangular, and Blanket modes.

The Anvil Horn 0° variant of this versatile sleep system comes with an attached pad sleeve so you can secure your sleeping pad beneath you for extra security when you set up camp.

Made from high quality materials like recycled polyester Ripstop shell fabricdown insulation, and synthetic Nano Loft insulation on the foot box area, Anvil Horn 0° ensures optimal comfort even in colder conditions.

Diamond Park 0°

is a sleeping bag from Big Agnes with sophisticated modular designs that packs 3 configurations in 1 sleep system. The temperature rating for the Diamond Park 0° is 0 degrees which comfortably fits most camping conditions and climates.

Its inner bag can be used independently while its outer bag helps secure the sleeping pad even further when attached together, making it an ideal all-season setup for campers and backpackers alike.

It offers superior comfort as well as lightweight packability, perfect for those who are always on the go without sacrificing warmth or quality materials. With its versatile design features that maximize protection from colder temperatures and external elements, the Diamond Park 0° is a reliable option to bring wherever your outdoor adventures take you!

Lost Dog 0°

The Big Agnes Lost Dog 0° is a cold weather sleeping bag that offers the convenience of modular design with three different configurations. It features high-quality insulated materials and an integrated pad attachment system to ensure extra security when camping or backpacking outdoors in cold temperatures.

This lightweight and packable sleeping bag has generous dimensions for comfort, it measures 82” x 36”, and weighs approximately 3lbs 4oz with a packed size of 10” x 18”. The exterior shell uses nylon ripstop fabric treated with DWR water repellent finish adding further warmth as well as making the lost dog 0° more durable in wet conditions.

Customer reviews note that this sleeping bag is very comfortable due to its soft interior designed, however there are potential issues noted such as difficulty in properly zipping up the outer quilt bag on occasion.

Additionally, those seeking an even warmer experience can consider similar products from big agnes – Anvil Horn 0°, Diamond Park 0° or Lost Ranger UL 3N1 0 ° all offering plenty of insulation without being overly bulky.

Lost Ranger UL 3N1 0°

The Lost Ranger UL 3N1 0° is the perfect sleeping bag for adventurous campers and backpackers thanks to its versatile, modular design. This three-in-one bag has downfilled insulation with a temperature rating of 0 degrees Fahrenheit along with an attached sleeping pad sleeve ensures maximum comfort in cooler temperatures.

It’s also crafted from Global Recycling Standard certified recyclable polyester taffeta for added sustainability, plus light weight and packability that make it easy to carry around on your journey.

The Big Agnes Lost Ranger 3N1 series offers creative solutions for different conditions so you can rest assured there’s something suitable no matter where you’re going or how cold it gets!

Additional information

Specification: Big Agnes Lost Ranger 3-in-1 Sleeping Bag


Big Agnes


650-fill down insulation, 100% post-consumer recycled polyester taffeta shell with PFC-free DWR coating (certified by Global Recycling Standard)

Max. Weight

3 pounds, 1 ounce

Max. Height

78 inches

Temp. Rating

15 degrees (F) / -9 degrees (C)

Kristina Meyers is a dedicated blogger based in Southern California. With a background in architecture and urban planning from the College of Art, Architecture, and Planning at Cornell University, and multi-media from the London College of Communication (formerly the London College of Printing), Kristina's passion for promoting fair trade, sustainability, and eco-friendly practices led her to create Fair Trade Finder. Kristina's passion for sustainability extends to her love for travel. She is an avid explorer who has embarked on camping and hiking journeys across stunning landscapes in Canada, Italy, the United Kingdom, Sweden, the Netherlands, Norway, and Switzerland. With an understanding of the importance of ethical choices in all aspects of life, Kristina brings her travel experiences to Fair Trade Finder. She curates a purposefully chosen assortment of fair trade products, with a particular emphasis on outdoor gear. Her ultimate goal is to empower fellow conscious consumers to make ethical and sustainable choices for their outdoor adventures.
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