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Why We Like It

Mountainsmith sleeping bag liners give you that extra layer of warmth in the backcountry and that extra level of security in your remote cabin bed. This one size fits all solution slides into your traditional or mummy bag to wrap you in comfort. Featuring durable ripstop construction and double-stitched seems, this liner will be able to keep up with you, while keeping your pillow secure with its built in pillow sleeve.


  • Durable ripstop construction
  • Featured a Rectangular and Mummy shape
  • Pillow sleeve
  • Double stitched seams

Poly Mummy Liner Reviews