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Your thin margin between frosty and toasty.

Sleep in the ALPS Mountaineering Razor Fleece Sleeping Bag/Liner alone on a mild summer night or stuff it inside an expedition weight bag to add additional fleece warmth when freezing weather strikes. The lightweight Razor stuffs down to a size you can easily fit in your winter camping bag, cross country sled or in your car as an emergency insulation option. When fully unpacked, the mummy shape easily slides into another bag, and the full-length, right-side zipper gives you the freedom to vent hot air or climb in and out of this liner without hassle.

  • Reviews
  • Q & A


  • Familiarity: I've used it several times

I love layering for cooler weather to make sure that I can always take off/put on a layer to be at the perfect temperature. So why not apply that to your sleeping bag situation? I bought this guy for a sea kayaking trip in Sweden in September. I had no idea what weather to expect. My summer weight sleeping bag is pretty old and has lost quite a bit of it's warmth, so I ordered this guy to have the OPTION to layer it into my sleeping bag if I needed it. It worked out great! I ended up using it every night, and sometimes had both bags zipped up, and other warmer nights I just left my summer sleeping bag completely unzipped underneath me, and just snuggled in this bag. Grab this bag and enjoy your perfect temperature.

add a few degrees and keep in the stink.

  • Familiarity: I've put it through the wringer

Was working for a conservation corp during the winter in southern utah and it gets cold in the desert. Had a 20F degree down but was still pretty chilly as i tend to run a bit cold, and this liner did the trick. It adds a few degrees, but dont expect much more.
Its inner is fleece is nice and soft and comfortable on bare skin, while the outside is made of nylon which makes it easy to slide into your sleeping bag. But this can become a problem as ive had the liner twist on me during my sleep. its also pretty roomy, for 5'7 me, and allows me to bring my knees up which is a plus. Also a plus it helps keep your body stink in and keeps your nice down bag from smelling as bad, for when your out in the wild for days on end and a shower is the last friend your expecting. expect the stitching to give at some point with heavy use unless strengthened manually, i would say you get what you pay for, but i got way more use out of it for the price.

Great for an extra few degrees

  • Familiarity: I've used it several times

Traveled around Iceland for 5 weeks in varying conditions--lots of nights did get pretty chilly, with temperatures near freezing. I used this bag as a liner for those nights in a summer-rated down bag. It was great at providing some extra much-needed warmth (though I did also wrap myself in a fleece blanket inside of this bag). I loved the feeling of the fleece, it was so nice and cozy. Having used the thinner cotton-like mummy liners, I much prefer this one. There's something to be said about the sturdier build of this liner as you don't get tangled up in the mummy liners. I'm a side sleeper and toss and turn a lot in my sleep, and I really really really loved how the outside surface of the liner rubbed easily against the inner surface of my sleeping bag... The fleece liner stayed perfectly around me while I moved inside my down bag. I like this aspect so much that I started using the bag on the nights when I didn't need it for warmth, just opened up the bags a bit and slept like a dream. I would't have slept well without this bag! I imagine it would also work well on a warm night, but I haven't had a chance to try that yet. The only downside is the packed size... It ends up being the same size as my sleeping bag, so it would be hard to take backpacking if I have to fit both in my bag (I've only used it car-camping).

my comfort blanket

  • Familiarity: I've put it through the wringer

I have used my liner for over a year and a half now. I can sleep in it down to 45 degrees Fahrenheit but I'm a little thick blooded so the reviews saying it's comfortable to 50 degrees are right on. I have used it with my 32 degree bag and got down to 20 degrees cozy as a kitten. The fleece is soft and does well with keeping me comfortable even when I'm sweating in my bag or climb in a little damp for the days precipitation.
I have to admit that I'm one of those weirdos that sleeps in a bag at home. So I have spent somewhere over 400 nights in this liner and still love it. The zipper stop did break recently from over use, but considering the amount of time I have spent rolling around in the bag I'm still impressed.

55° +

    I used this alone for sleeping while on a canoe trek. Didn't take up much space in the dry bag & performed great while temps didn't drop below 50°. I'm sure as a liner it will perform well this winter as well.

    Good for summer

      This bag works well for summer time and maybe a liner too. but you need a sleeping pad for sure.


      • Familiarity: I've used it several times

      This is one awesome liner. The fleece liner is comfortable an warm. For the cold nights its an extra layer of warmth. For the summer nights its the only thing I use.

      Extra Warmth

      • Familiarity: I've put it through the wringer

      Great liner to bump the warmth of your bag in cold weather, I've also used it by itself in warmer summer conditions.

      Game Changer

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

      I have not used this bag on it's own, but as a liner it is fantastic! It has definitely helped me get a few more fall months out of my sleeping bag. The hand is also way more pleasant than bag alone. The fleece lining just feels cozy.

      Can't complain.

        This bag is super comfy and it kept me warm all night. I had read the previous reviews before I purchased the bag and they were completely correct. You wont be disappointed with this bag.

        Cool Nights, Comfy Bag

        • Familiarity: I've used it several times

        This is a great bag for cool to warm nights. Fleece lining is comfortable and adds just enough insulation for summer nights. Packs small but gives just enough room for a good night sleep


        • Familiarity: I've used it several times

        Good bag for warmer nights without much of a breeze. Length and width feel right and it packs down fairly compact for an easy toss in the back of the car for all trips as a "just in case"

        Warm Weather Bag

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

        Great warm weather bag. Bought this on sale, so it was totally worth it. Like other reviewers have mentioned, it's heavy. I used this in 60-70 deg. evening temps and it kept me very comfortable. I'm an athletic build, 5' 6" woman and I had plenty of room to flip and toss inside the bag to keep cool. I unzipped it all the way down to the bottom and laid the flap across me. I did not have any problems with temperature regulation through the night, like I would have even sleeping on top of my 30 deg. Sierra Design.

        This will be my go-to bag for all of my Florida trips. Win!


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

        My problem: I camp in 30-40 degree weather at least one weekend/month through fall and spring. My mummy bag, while rated to 20 degrees is (a) not warm enough and (b) makes me super claustrophobic so I cant' get comfortable enough to sleep. This thing fixed both problems.

        The Razor is larger than my mummy bag (a short women's bag), so I can zip all the way into the Razor without getting claustrophobic. (It even has a hood!) Then, I lay my unzipped mummy bag over me, comforter-style. I spent last weekend camping in the 30s at night, and this new set up was excellent!

        I just might survive this season's Joshua Tree trips yet...

        I still want to eventually upgrade to the Backcountry Bed, but until I can afford that price tag, the Razor has made cold-weather nights tolerable. Well, well, worth the price.

        (Also - as others have said, this thing can be used as a warm-weather sleeping bag. As the morning warmed up, I pushed my unzipped mummy bag off me and was super comfortable in just the Razor. Unfortunately, I rarely get to experience the joy of sleeping outdoors when it isn't cold!)

        Hi Leslie... I noticed you have been to Joshua Tree NP for several times.. I am planning to go there at Dec. Would the temp be around 30 F at that time?

        Sorry woohoo, I just saw your comment...a year too late! But, yes, in Joshua Tree in December you can expect low/mid 30s at night.

        Great warm weather bag

        • Familiarity: I've used it several times

        I bought this specifically for summer backpacking. It packs fairly small and is warm enough for when a summer night turns chilly if you add socks or even a full base layer on cold nights. It's cool enough for those hot nights where you unzip it most of the way. I'm 5'10" 190 and it's a good size for me. I don't get cramped but I'm not swimming in it. It packs down fairly small and if you're careful you can actually pack it into itself using the "head" as a form of wrap for the rest of it. It doesn't pack to its smallest that way, but you can then compress it with other items. Sure, for a few hundred dollars or more you can get a down bag you have to keep dry that packs down smaller and weighs less, but part of the appeal is that this is inexpensive enough to have in addition to other options. I'd rather spend the extra money on a bag for cooler weather. I'm not sure how this really qualifies as a liner, but I guess if you have a slightly oversized regular bag you could use it that way. It's clearly designed to operate as a stand alone unit though.
        I've only used mine four times, for a total of six nights sleep, but I'm quite happy with it and can't imagine finding something better for the price.

        Does this liner have a "pillow pocket" of any sort to stuff in that annoying little runaway pillow of mine?


        This does not have a pillow pocket

        could I use this bag for summer camping...

        could I use this bag for summer camping where I need it to compress down to a small size ( canoe/hiking trips )

        Hey elliot,

        Thanks for your question.

        This is not a sleeping bag. It is only a bag liner. If you would like to find a bag that can compress really small I suggest you hop on chat and get in touch with our gearheads (chat is available 24/7). You can also call us at 1-800-409-4502 (6am-10pm).

        Best Answer

        Grant I love you but, this customer should call us 1-800-409-4502. I bet on a warm summer night you could get away with this as a stand alone bag, I would still worry. Even nights in the desert get kinda cold, I am always psyched to have my 40 degree synthetic bag. If your going ultra light weight hiking then you are planning to suffer anyway, this might just be the ticket.

        Grant and Bill I love you both and I don't disagree with either of you.

        These liners are really only designed to add about 5-10 degrees onto a bag and I think for summer camping they CAN be great as a standalone but only in conditions where you would feel safe to sleep fully exposed (no bag or liner) and just want that extra comfort. Otherwise, why risk it? Get a decent 40 degree bag like Bill suggests and sleep with it unzipped if it starts to get too warm.

        Hello Guys. Just wanted to let you know that the manufacturer does state the following on their site: "Great as accessory or standalone bag" and under the description tab: "As a standalone bag, it can be used in warmer temperatures when you only need a very lightweight bag." . So, yes, it can be used as a light standalone bag but the problem lies in the rating, which does not exist for this bag. Opinions I've read here and there are that this is a 50 to 60 degree bag. I just ordered one of these for my 20 degree bag since it will be the first time I will be ever cold-camp at the RMNP next weekend.

        Hey guys! I stayed at RMNP this last Oct - Nov, like I said I would, doing the Tonahutu/North Inlet Trail for a couple of nights and in the snow. The liner did wonders to my Kelty 21 down bag as the temp dropped to the mid-teens and I was able to hold the fort in my lite/cheap tent. I was wearing a heavy polartec bottom and a thermal top. At some point around 5 AM, I put the Sierra Dridown jacket you see in the pic. The razor is probably good down to 50 F.

        Hey guys! I stayed at RMNP this last Oct - Nov, like I said I would, doing the Tonahutu/North Inlet Trail for a couple of nights and in the snow. The liner did wonders to my Kelty 21 down bag as the temp dropped to the mid-teens and I was able to hold the fort in my lite/cheap tent. I was wearing a heavy polartec bottom and a thermal top. At some point around 5 AM, I put the Sierra Dridown jacket you see in the pic. The razor is probably good down to 50 F.

        Does this bag pack down small enough to...

        Does this bag pack down small enough to place in a pannier for bicycle touring?

        Best Answer

        This is just a liner, not a sleeping bag, so yes, it packs down quite small. About the size of a grapefruit (or smaller).

        Actually, I just got this liner from SAC, and it is much larger than a grapefruit. It is about 8" tall x 6.5" wide in the stuff sack, straight out of the box (I can never get stuff to compress back to as small as it was out of the box, so I'm guessing this is as small as it gets.)

        I tend to sweat against the nylon sleeping...

        I tend to sweat against the nylon sleeping bag. Is the internal material fleece or other? And how is it for sleeping against / moisture wicking? Thanks...

        The internal material is a thin, grey fleece. Another Scoutmaster bought one of these on sale and was demonstrating it at the last meeting. He is a big guy, 6' and close to 300#, probably 50 inch chest. He had room inside to zip the bag and move his arms.


          Just saw that there wasn't a weight listed. This weighs 1lb, 10 oz.