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Sierra Designs Middle Mountain 20° Synthetic Sleeping Bag

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Regular price Was: $99.99 Now: Sale price $59.99

Leaves our warehouse in 2 business days.

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Check out the mountain of evidence to show that the Middle Mountain 20°F Synthetic Sleeping Bag is a great Sleeping Bag for your summer camp and other camping needs! Its mummy style shape makes for optimal thermal efficiency. And it’s packed using 550 fill hydrophobic down that’s lightweight and compressible for convenient packing but still providing great warmth to keep you cozy on a night as cold as 20°F. The Middle Mountain is a PFC-free mummy bag constructed from recycled materials for a sustainable sleeping system that really delivers on comfort when you’re out roughin’ it. Equipped with SierraLoft™ synthetic insulation and a durable water repellent shell, you’ll stay warm and dry even when conditions are damp and cold. Cinch in the heat around your head with its adjustable hood. Convenient details like an anti-snag zipper, internal stash pocket for nightly essentials, and the included compression sack make things as comfortable as possible. Sleep tight.

The Sierra Designs Story

Founded in 1965 by Bob Swanson and George Marks, Sierra Designs was built on the basis of providing excellent gear to adventurous spirits from all walks, whether you’re an expert thru-hiker or a first-year summer camper. Bob and George first met as co-workers at The Ski Hut, an outdoor equipment retailer in Berkeley, where the two often dreamed of owning their own business. This outdoorsy duo got their wish one day when a wealthy benefactor gave them the money they needed to seed their new company: Sierra Designs. The Sierra Designs family is still composed of outdoorsy folks who all happily to do their part to protect our environment. For them, it means making products with as little impact to the environment as possible such as using recycled material and creating an environmentally-friendly water repellent that’s PFC-Free. As they like to say, “Think outside, because happiness is found in the adventure.”


  • Material: 68D Partially Recycled Polyester Shell
  • 20°F Mummy Style Sleeping Bag
  • 68D Partially Recycled Polyester Pongee Liner
  • PFC-Free C0 DWR
  • SierraLoft™ Synthetic Insulation Traps Warm Air and Keeps it Close to your Body
  • Optimal Shape for Thermal Efficiency
  • Hood Cinch Locks in Heat
  • Internal Stash Pocket Provides Convenient Storage
  • Anti-Snag Zipper Tracks for Easy Use with a Draft Tube along the Zipper to Trap Warmth
  • Comes with Compression Stuff Sack for Compact Storage
  • Weight: 3lb 15.3oz
  • Fill Weight: 48oz
  • Fits To: 72"
  • Length: 80"
  • Shoulder Circumference: 60"
  • Hip Circumference: 58"
  • Foot Circumference: 40"
  • Stuff Sack Size: 10 x 11”
  • Lifetime Warranty

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