Middle Mountain 20


Out of stock


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 Sierra Designs 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.


Sierra Designs
MFG Sku/Part Number:
3 lb 15.3 oz / 1.8 kg
Temperature Rating F:
Temperature Rating C:
Insulation Type:
SierraLoft™ Synthetic Insulation
Fill Weight:
48 oz / 1.36 kg
Shell Material:
68D Partially Recycled Polyester
Lining Material:
68D Partially Recycled Polyester Pongee
Fits To: 72.0" / 183.0 cm
Stuff Size:
10 x 11 in / 26 x 28 cm
Circumference at Shoulders:
60.0" / 147.0 cm
Circumference at Hips:
58.0" / 147.0 cm
Circumference at Foot:
40.0" / 102.0 cm
Other Features:
  • 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.

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