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MegaSleep Duo 25/40

MegaSleep Duo 25/40

Regular price $199.95
Regular price Sale price $199.95
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  • This product is carbon offset with myclimate.

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Temperature Range

Comfort temp: 40 °F
Limit temp: 25 °F
Extreme temp: 5 °F


M: 70.2 oz
L: 80.8 oz


M: 63 x 78.7 in
L: 63 x 82.7 in

Fits up to body size

M: 75 in
L: 79 in

Packed Volume

M: 14 L
L: 14 L


Sleeping bag, mesh storage duffle




40 D ripstop nylon, OEKO-TEX® 100 certified, PFC free, DWR free


40 D nylon, OEKO-TEX® 100 certified, PFC free, DWR free


100% polyester, OEKO-TEX® 100 certified, PFC free


PFC free product label EXPED myclimate logo

Climate Contribution

EXPED calculates all climate emissions from the production and transportation of this product and finances certified climate protection projects through myclimate to an equal extent.

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OEKO-TEX® Certified Material

This product features OEKO-TEX® STANDARD 100 materials or dyes. See MATERIALS tab for details.

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This product is free of per- and poly-fluorinated compounds, a group of non-degradable, man-made chemicals commonly used as dirt and water repellants.


Shipping & Returns

Orders are shipped from our warehouse Monday through Friday (except holidays) within 2 business days. ships to addresses in the United States, APO/FPO and U.S. Territories only. If shipping to a military or U.S. Territory address, please select USPS Priority Mail at checkout. 

Orders shipping via UPS Ground will arrive in 8-10 days, UPS 2-Day in 4-6 days, and UPS Next Day Air in 2-3 days. USPS shipments may take 8-10 days for delivery. These shipping rates include order processing time.

Orders are eligible for return within 60 days.

If you do not receive your package in the above time period, please contact us at with your Order Number. 

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Product Description

Duplicate your at-home sleep experience in the outdoors — Together!

MegaSleep Duo is a supremely versatile 4-in-1 sleep solution, offering multiple configurations and temperature ratings. It covers couples and solo sleeping with warm and cool night options. Simply flip the bag over to change the amount of insulation on the top side - dark blue side up for cool nights (down to 25°F), light blue side up for warm nights (down to 40°F). Additionally, each side can be converted into a solo bag or blanket, creating one for cool nights and one for warm nights.

Designed to fit EXPED MegaMat and MegaMat Duo, MegaSleep is the lightest and most compact duo sleeping bag in its class. It was designed specifically for use as an overlanding and car camping bag. However, because it weighs just 4 lbs. and compresses amazingly well, it can also be used for human-powered adventures such as backpacking, kayaking, canoeing, etc.

  • 2 temperature ratings

    Available in 2 temperature ratings: 25 °F (light blue side down) and 40 °F (dark blue side down).

  • 4-in-1 solution

    Versatile, 4-in-1 sleep solution: Duo cool-weather side, duo warm weather side, solo cool weather bag/blanket, solo warm weather bag/blanket.

  • 3-D anti-snag draft tube

    Full-length draft tube along the zipper to stop heat loss & enhance warmth.

  • Microfiber insulation

    Durable, warm, quick-drying microfiber insulation for resilient, long-lasting performance.

  • No harmful chemicals

    All next-to-skin fabrics are treatment-free, minimizing skin contact with allergens or chemicals.

  • Pair with MegaMat

    Roomy rectangular shape fits MegaMat or MegaMat Duo perfectly.

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How do I wash my sleeping bag?

For most sleeping bag cleaning, we recommend spot-cleaning with a damp sponge.

If the bag needs a deeper cleaning, use a front-loading machine with no agitator and follow the directions below based on the type of sleeping bag you have: 

  • For the EXPED MegaSleep and other synthetic-insulated sleeping bags, start by zipping the bag fully closed. Use a gentle or mild detergent. Select cold water and the delicate cycle on a front-loading machine. Do a second rinse cycle once the wash is complete. This will ensure all detergent is removed. Next, we recommend two spin cycles, which will remove excess moisture. Dry in a dryer with low or no heat or hang dry synthetic sleeping bags over. Be sure to support the sleeping bag over several lines or rungs of a drying rack to reduce stress on any one section of the bag. 
  • For down-insulated sleeping bags, start by zipping the bag fully closed. Use down wash as a detergent. Select cold water and the delicate cycle on a front-loading machine and do a second rinse cycle once the wash is complete. This will ensure all detergent is removed. Next, we recommend two spin cycles, which will remove excess moisture. Dry in a dryer on the medium heat setting. Include two or three clean tennis balls in the dryer to fluff the down and restore full loft.

Do you use any harmful chemicals on sleeping bags?

All fabrics used in our sleeping bags are OEKO-TEX 100 certified. This means they are free of any flame retardants and PFCs (perfluorochemicals).

Please visit the individual product page for details and specifications.

How should I store my sleeping bag when not in use?

When not in use, we recommend storing your sleeping bag in a large mesh storage sack. This ensures the bag's insulation retains the maximum loft and warmth in use. When traveling it is okay to compress the bag and keep it stored in a waterproof dry bag. 

If the down is compressed or lacks loft after a long trip, put the sleeping bag in a dryer on a no-heat setting with two or three clean tennis balls. If the down does not regain its loft, it may need to be washed according to the instructions.

When you return from a trip it is very important to dry your sleeping bag completely. Unzip the bag, spread it over a couch or several chairs and make sure it’s dry before storing it in the mesh storage bag.

It’s best to store sleeping bags in a dry, temperature-controlled room, away from pets.

What are EN temperature ratings for sleeping bags?

The EN (European Norm) rating is a strict test designed to provide objective measurements and standardize how sleeping bags with hoods are compared and marketed across brands. It is intended to help customers make informed choices using independently derived temperature ratings.

Each EN sleeping bag test produces four temperature ratings - Upper Limit, Comfort, Lower Limit and an Extreme rating, with the following definitions:

  • Upper limit - the temperature at which a normal man* can sleep without excessive perspiration. It is made with the hood and zips open and with the arms outside the bag.
  • Comfort - the temperature at which a normal woman* can expect to sleep comfortably in a relaxed position.
  • Lower limit - the temperature at which a normal man can sleep in a curled position for eight hours without waking up.
  • Extreme - the minimum temperature at which a normal woman can stay for six hours without risk of death from hypothermia (although frostbite is still possible).

*For the EN rating, it is assumed that a “normal man” is 25 years old, 1.73 m tall and weighs 73 kg; a “normal woman” is 25 years old, 1.60 m tall and weighs 60 kg.

EXPED uses three of these ratings in the technical specifications of each bag: Comfort, Lower Limit and Extreme and sleeping bag names include the Comfort rating. It’s important to keep in mind that the temperature rating tests assume that the person sleeping is wearing thermal layers and sleeping on a mat with an R-value of 5.4. 

EN ratings are derived from controlled, scientifically repeatable tests and allow sleeping bags to be compared across brands. The humans who use these sleeping bags cannot be so precisely measured, however. Many variables affect how warm a person will be inside a sleeping bag. Level of fitness, quality of recent sleep, level of hydration, level of exhaustion from the day’s efforts, food recently eaten, personal reactions to altitude, mental state and other difficult-to-quantify factors can have a significant effect.

Additionally, most people can identify themselves as either a “warm sleeper” or a “cold sleeper.” For cold sleepers, EXPED recommends choosing a sleeping bag one temperature rating warmer than EN tests would suggest. Also, because most of the heat lost in a night’s sleep goes into the ground, a properly insulated sleeping mat for the conditions is critically important.

Luckily, EXPED is world famous for making warm and comfortable sleeping mats! 

How do I choose the correct size sleeping bag for my height and build?

It’s best to choose a sleeping bag that is close to your body size. Because your body heats up the space in the sleeping bag, if the empty space in the sleeping bag is much larger than your body, it will take more body heat and more time to heat the space. If you prefer a roomier sleeping bag, you may want to size up, but keep in mind you may not heat the space as efficiently.

In-House Gear Repair Services

Our goal is to keep gear out of the landfill by doing repairs whenever possible. Learn more about how to submit a warranty or repair claim.

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