Middle Mountain Mummy 20°


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Sweet dreams are made of this.

You might be new to the trail, but a great night’s sleep is an old habit you have no intention of ditching. Designed for optimal thermal efficiency, the Middle Mountain is a PFC-free mummy bag made from recycled materials for a sustainable sleeping system that doesn’t skimp on comfort when camping off the grid. Stay warm and dry even in cool, damp conditions with SierraLoft™ synthetic insulation and a DWR-treated shell, and cinch in the heat around your head with its adjustable hood. Convenient details like an anti-snag zipper, internal stash pocket for nighttime essentials and the included compression sack are sure to keep your backpacking goals and dreams within reach at all times.


  • Recycled polyester shell and soft pongee liner for a lightweight, durable bag, while reducing the environmental impact.
  • PFC-Free C0 DWR.
  • SierraLoft™ Synthetic Insulation is designed to capture warm air and keep it close to your body.
  • Mummy shape creates optimal 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 prevent warmth from escaping.
  • Comes with compression stuff sack for compact storage.


  • Shell: 68D Partially Recycled Polyester
  • Liner: 68D Partially Recycled Polyester Pongee
  • The state of Utah requires online retailers to provide product law labels online. Click the link to view the label.


  • Temperature Rating: 20.0°F / -7.0°C
  • Bag Shape: Mummy
  • Weight: 3 lb 15.3 oz / 1.8 kg
  • Fill Weight: 48 oz / 1.36 kg
  • Fits To: 72.0" / 183.0 cm
  • Length: 80.0" / 203.0 cm
  • Shoulder Circumference: 60.0" / 147.0 cm
  • Hip Circumference: 58.0" / 147.0 cm
  • Foot Circumference: 40.0" / 102.0 cm
  • Stuff Sack Size: 10 x 11 in / 26 x 28 cm