I used this liner with my StS Trek bag on a double-circuit teahouse trek in Nepal. Teahouse rooms are unheated, and many are over 12,000'. This warm, stretchy and comfortable liner helped keep my bag clean and me warm, the very few times I needed it for warmth.
Only 4 stars, because:
My StS bag has a separate zipper for the footbox, that I usually have open, even at high elevations and thought the liner would, too. I thought this because the pictures online (& even the one StS attached to the email asking for this review), plus wording on the box state the bottom has a drawstring. It doesn't for the semi-rectangular version I needed. So, my dear spouse ripped the bottom open and sewed one in.
StS did apologize for the incorrect wording on the package, and made it as right as they could.
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