Basecamp Synthetic Sleeping Bag

The sleeping bag that isn't clingy, it gives you your space

$199.00 – $349.00

Size Guide
What Is This

Sleeping Bag Temperature Ratings Explained

The EN Rating scale is a scientific test to determine the warmth of a sleeping bag. Unisex sleeping bags list the Lower Limit which is the lowest temperature rating that an average male sleeper would be comfortable in. Our women’s sleeping bags list the Comfort Limit, which is the lowest temperature rating at which an average female sleeper should be comfortable. The comfort and lower limit temperature ratings are listed in the features table on the product page.

For example, a unisex sleeping bag that shows a Lower limit of 23ºF means a man should be comfortable down to air temperatures of 23ºF. The same bag will also have a Comfort limit, in the realm of 32°F, so a woman would be comfortable down to an air temperature of 32ºF. Men and women should always sleep in a layer of long underwear and use a sleeping mat with an R-Value appropriate for expected ground temperatures – without this, the sleeping bag itself is unlikely to keep the sleeper warm enough.

Here’s a basic categorization of appropriate use, based on rated temperatures:
Summer:   >+35ºF / +3°C
3-Season:   +10 to +35ºF / -15° to 0°C
Winter:   <10ºF / -15°C

A huge variety of factors can impact sleeping bag warmth - the above temperatures are merely guidelines, not guarantees. It’s important to think of a sleeping bag as one element in a sleep system which also includes an appropriately insulating sleeping pad and a liner. For instance - if you plan on sleeping in nighttime air temperatures of 27ºF / -3°C, choose a bag with a gender-appropriate rating of 23°F / -5°C nights, plus a sleeping mat with an R-Value of 2.5 to 3, and consider a Reactor thermal liner. If you have any questions about which temperature sleeping bag / R-Value sleeping mat you should select, or how to improve your warmth in a sleep system, reach out to us via our contact page any time.


Other ways to purchase

No Online Retailers Stocking Current Selection


The generously sized and ultra-versatile Basecamp™ options are also available in a synthetic version. This is an excellent choice when price and easy care are key considerations.  These sleeping bags have the same generous rectangular shape and versatile design as the down version.  They are insulated with Thermolite® that is built into the bags using a unique Wave Loft construction and helps retain warmth. The inner fabric is a soft, luxurious polyester that feels like silk for sleep-filled comfort. With multiple zippers, the Basecamp™ allows you to cozy up to your partner by zipping bags together, vent when it gets too hot, or remove the top entirely to use as a camping quilt or blanket. The Basecamp™ models have been designed to work with a sleeping mat and pillow to create a comprehensive sleep system you can really get comfortable with.


Packed Size Comparison

20°F: 11.6 L ≈ About the size of a large bear canister
10°F: 14.6 L ≈ Classic middle school backpack


20°F: 3 lbs 10 oz ≈ Roughly the same weight as a standard pillow
10°F: 4 lbs ≈ Roughly the same weight as a standard pillow


20°F: 3 Season - Built for fall and all of spring. Perfect for summer when used as a quilt.
10°F: 4 Season - take this bag out from fall to spring, perfect in summer as just a quilt.


Generous, practically like sleeping in a regular bed


  • Uses THERMOLITE synthetic insulation
  • 2D PermaShell™ water-resistant shell fabric
  • Spacious rectangular shape
  • Pillow attachment system under the hood to hold an Aeros™ pillow in place (not included)
  • Two positions sleeping mat attachment system
  • Zip draft tube with anti-snag
  • Cushioned internal hood draw-cord
  • 2-way YKK® #5 zip on each side of the bag
  • Can zip to any Trek™, Talus™, Latitude™, or Micro™ (model year 2017 or newer) sleeping bag
  • Includes a Nylon compression bag