MountainsmithPoly Sleeping Bag Liner

Smart investment.

Expand the versatility of your sleeping bag with the Mountainsmith Poly Sleeping Bag Liner. This lightweight and compressible liner adds warmth without tacking on a ton of bulk or weight, or requiring you to buy a different bag, and it extends the life of your sleeping bag by protecting it from sweat and oils.

  • Add extra warmth to your bag with this liner
  • Polyester fabric is smooth and wicks moisture
  • Open access cover for easy entry and exit
  • Includes storage sack for convenience
  • Reviews
  • Q & A

Does this pack down to a very small size...about the size of a softball?

Hey jcrabil923031! It does pack down decently small, yeah! It fits into that carrying case that you see on the third pictures. That carrying case is about 8 x 7 x 3 inches, so pretty small for sure. If you have any other questions, let me know! My contact details are above.

Sleeping back liner

  • Familiarity: I've used it several times

I was concern when I saw the less than 12 dollar price but I'll tell you this, I was very happy with the item. Perhaps I could have gotten a better liner for 7 times the price but, why? This liner did everything I needed. Extra warmth, comfort and kept my quilt clean.
In my opion save your self a bunch. Buy this inexpensive liner, you'll be happy with purchase.

Quality material, great price

  • Familiarity: I've used it once or twice and have initial impressions

I bought this item to add some warmth to a summer sleeping bag. It's great protection for the inside of my bag but I don't know that it added much in the way of temperature support. For the price though it was worth a shot.

For context my summer bag is rated at 35 degrees and I was camping in low 20s.

Two thumbs up

  • Familiarity: I've used it several times

For the price you can't beat this sleeping bag liner. Its perfect to take camping or on an European adventure.

Unanswered Question

Do you know how much "extra warmth" this liner provides? The description is a bit vague and I can't find a specific number listed anywhere online.