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Backcountry Bed Duo 35 / 700 DriDown

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Sierra Designs Backcountry Bed Duo 35, blue with white stripe, fully closed

Double the pleasure, double the fun.  

With enough room to twist, turn over, and toss about, the Backcountry Bed Duo will be your go-to bag from here on out. With an integrated comforter to keep the drafts out, you and your partner will have all the amenities of sleeping like at home, regardless of where your adventure takes you.

Key Features

  • Specified for sleeping conditions down to 35 Degrees
  • Patent pending zipperless design allows for more comfort
  • Insulated hand/arm pockets help to seal out drafts
  • Patented self sealing foot vent for fast and easy ventilation
  • Stretch cord closure system helps to seal out drafts
  • Sleeping pad sleeve keeps pad under you for comfort and warmth and replaces unnecessary bottom insulation


  • Insulation: 700FP PFC-Free DriDown
  • Shell Fabric: 20d polyester ripstop
  • Liner Fabric: 20d polyester taffeta

Tech Specs

  • Temp Rating: 35F / 2C
  • Fill Weight: 23.9 oz / 677 g
  • Minimum Weight: 3 lbs 12 oz / 1707 g
  • Sleeping Pad Sleeve Circumference: 45.5" / 115.6 cm or 55.5" / 140.9 cm
  • Fits Sleeping Pad (WxH): 2 x 20"/51cm or 2 x 25"/64cm
  • Fits Up To: 6' 4" / 193 cm
  • Length: 84in / 213 cm
  • Shoulder Circumference: 107" / 272 cm
  • Hip Circumference: 105" / 267 cm
  • Footbox Circumference: 92" / 234 cm
  • Mesh Stoarge Bag Size (LxW): 26 x 13" / 66 x 33 cm
  • Stuff Sack Size (L x W): 16 x 8.5" / 41 x 22 cm
Gender: Unisex
Insulation: DriDown
Temperature Rating: 35 Degree

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    Product Reviews


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    1. Excellent backpacking choice

      We are both north of 55 yrs and joints are starting to wear, so it was time to lighten the packs. Took this bag on a week long backpacking trip on the Superior Hiking Trail along the north shore of Lake Superior in Minnesota. Rugged country, a lot of steep terrain, lots of up and down during the day. Dropped the weight of one sleeping bag by going with the Backcountry Duo 35. Combined this with 25" and 20" Thermarest Neo Air mattresses. And retired the old sierra designs Sirius 3 tent, saved a few pounds again with Sierra's Summer Moon 2. We lightened our packs significantly, and cut down on the bulk as well. Very happy with the sleeping bag, and it compacts nicely in the pack as down always does. The sleeves for the sleeping pads hold the pads firmly in place, makes for a better sleep when you don't find yourself sliding off your pad in the middle of the night. Got low 40's temps one night, bag did just fine keeping us warm. Very comfortable bed, well made and well thought out in design. on Sep 12th 2018

    2. It's weight is worth the cost.

      Fairly comfortable, though I wish outer top blanket extended further down to allow greater opening. Also if there could be some stretch in the mid section so that a a couple could sleep in opposite directions with their knees pointing away (opposite from each other....that would be great too.

      that said, enjoyed the lightweight component on our recent backpack around Hood on the Timberline Trail.

      also, like most other down fill bags, there is the occasional feather floating around.
      on Aug 24th 2018

    3. Seems almost perfect

      Haven't gotten to take it out for an actual test run yet, but from setting it up in the house this bag seems like it hits almost all the marks: comfortable, sized well, lightweight, packable, and warm. The only thing I wish was different so far is that the pad sleeve was adjustable to fit our Exped double pad. on Jun 19th 2018

    4. Works great

      I was skeptical of the 35 degree rating. With the rain fly on it was fine down to 35-30. Makes sleeping with a partner fantastic. I liked the fact that I could use an existing sleeping pad. on Feb 14th 2018

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