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Adapt to the crazy temperature dives and spikes on your next trip to a yurt or hostel when you sleep in the reversible The North Face Mercurial Liner Bag. This baffled bag adjusts to your desired sleeping temperature through three different insulation options. With the grey baffles on the outside, the bag lets in cool air on warm nights. With the black liner outside and the baffles inside, a cold air barrier keeps your body heat close when you need it. If you sleep with the Mercurial’s soft polyester floor as a cover, it can also keep you comfortable on hot nights. The whole bag unzips flat like a blanket, and the inverted stuff sack also functions as a pillow.

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Here's what others have to say...


Really a summer bag

  • Gender:Male
  • Familiarity:I've used it several times

I have been using the bag during my last trip to the Gran Canyon / Brice etc, below 50F you will feel cold, very small space and weight

I'm looking for the best of all worlds,...

I'm looking for the best of all worlds, is this it?

Best Answer

Probably not. I don't see that it comes preloaded with a suitable snuggle companion.


Not that warm!

    Leads one to believe there are 3 differing temperature ranges, but I was pretty much unable to stay warm sleeping in it in the house.


    good for late spring to early fall

      Used this bag/liner on it's own so far and have been very happy. I have used all three ways of comfort and have slept well. Lowest night temps in this bag was about 50°f without a liner and was comfortable and preferred method of sleeping is draws only. Any lower may be a issue. The width of the bag is nice but let it be known that this bag does not have a hood(comes just over the shoulders). I'm 6'1" and I use the long. I do carry a StS liner just for that extra kick if needed.

      Unanswered Question

      What's the width?

      What's the width?


      Innovative design

        I like the innovative design. I am a warm sleeper in general, so needed a bag that could be a good Sierra summer bag. So far on only two trips this bag has done well. I like the way I can adjust the temperature as needed when I get to my destination by turning it this way and that way. Wish it would pack a little smaller. As it is likely only a summer bag, a down version would be great to save weight and size, but this is pretty small as is. Seems well constructed and roomy. I am 6'1" and the tall fits me well. Might be nice of them to add a small mummy head portion that you could use if needed, but if it gets that cold a hat will do or a heavier bag.

        To what temperature is this bag rated?

        To what temperature is this bag rated?

        Best Answer

        ^^ Don't got by a suggestion like that. I wish people would not answer when they don't know the answer. You don't want to "just guess" when it comes to your comfort or safety outdoors. The ratings are always available from the companies that produce the gear - don't just ask and let random people tell you what they "think" when the info is out there for you to find.