Marmot NanoWave 45 Sleeping Bag: 45 Degree Synthetic
MarmotNanoWave 45 Sleeping Bag: 45 Degree Synthetic

A small and light bundle of warmth.

When you're bicycle-touring cross-country, paddling for a week in the Boundary Waters, or backpacking Isle Royale, space and weight are at a premium. Bring along the Marmot NanoWave 45 Sleeping Bag, and stay comfy at night without contributing to any back-crushing weight during your daytime travels. This lightweight yet durable bag uses high-loft Spirafil 100 synthetic insulation to keep you warm on chilly summer nights. 

You might be tempted to think that, at less than two pounds, the NanoWave skimps on features of convenience and functionality. Have no fear; Marmot created this easily-packable bag while still focusing on the details. Blanket construction, a snagless draft tube, two-way zipper sliders, and a zipper garage all contribute to comfort and convenience. Expertly designed features like "feely" drawcords and hang loops prove that Marmot's designers have been out there and know what features adventurers like you want. 

  • Rated to 45 degrees Fahrenheit
  • High-loft Spirafil 100 synthetic insulation
  • Feely drawcords
  • Snagless draft tube
  • Two-way zipper sliders
  • Blanket construction
  • Two hang loops
  • Zipper garage
  • Compression stuff sack
  • Reviews
  • Q & A

Nice sleeping bag

    Packs small and is light. A little tight for someone with broader shoulders but would buy again

    Unanswered Question

    I'm trying to figure out what marmot bags are zipper compatible for cuddles. What, if any, are fitting for this?

    Great for saving space

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

    Great sleeping bag for hiking and camping in the summer time. Compresses down nicely and has been pretty comfortable during the nights

    Unanswered Question

    Trying to decide between this and the 55.. I have a 15 degree big agnes bag, which would be the better bet for a summer bag that would exclusively be for 50 degree + nights?

    Compact and lightweight

    • Familiarity: I've used it several times

    The bag compacts nicely and can fit into a smaller, standard backpack. The temp rating is pretty accurate. Temp dropped down into the mid 30s so it was chilly but by morning I was very comfortable in it.

    Compression Stuff Sack

    The compression stuff sack will compress to about 6x11 inches.

    Compression Stuff Sack

    great quality for price

    • Familiarity: I've used it several times

    temperature rating is pretty exact.. took with on a climb of Middle Teton and it dropped to 40 degrees, so was a little chilly-- but packs small and well made

    Packs small

    • Familiarity: I've used it several times

    I have been using this when going up to Lone Peak and it has been great I can pack a smaller bag with my climbing gear and camping gear and not have to carry the bulk of a large pack all the way up there.

    About how small? Doesn't say in the specs. Thanks in advance.

    Stuff Sack Size is 6x11 inches.

    Great for summer camp.

      It's light, packs tight, and won't over heat you. I don't like sleeping warm in the summer time so it was perfect for me.

      A nice piece of kit!

        If you camp in moderate climates like Southern California, this is your "go to" sleeping bag. In warm weather, you can use it on its own. If it dips down below 50, then use your clothing to layer on added warmth. It packs down nicely and doesn't tip the scales. You can't beat that for the price.

        Just wondering what the approximate dimensions of the bag when stuffed its compression sack are?

        Sorry about that delay Candace, it would be 6x11 inches!

        If there is anything else I can personally help you with please email me at

        Really wanted to like this!

        • Familiarity: I returned this product before using it

        I give this 5/5 for quality and feel... but, only 3 for fit. Several other reviewers say this fits 'slim' and they weren't kidding. This bag just doesn't have the girth at the shoulder or upper leg that my BA bags do. I felt really constricted when I tried it out. I'm 6'-0, medium build, and 190lbs. Length was good though - even roomy in the length, but just way too tight across the shoulders. I'm a side sleeper and there was little room to turn over, or bend a leg. That said, the quality of the bag seemed very good. Well made, soft, warm, and light. I really liked the bright, cheery red. Bag was very easily stuffed back into its compression sack, and is light weight. I wanted to keep this because I like Marmot products, but the size just isn't big enough for someone with a 42 jacket size or over.

        Sweet and Simple

        • Familiarity: I've used it several times

        I use this bag along with my eno hammock system.
        It packs down small, it's lightweight and keeps me cozy on Kentucky summer nights.
        Great value for summer backpacking.

        I have read complaints about the stuff sack, but I have not experienced any issues. If you take the time to fold the sides in and roll the bag up tightly, it fits fine in the provided stuff sack.

        I do wish it were a full zip bag so that I could open it all the way up.

        Just wondering what the approximate dimensions of the stuff sack are?

        Love that you mentioned KY, mainly looking for a bag to take to the gorge with my ENO. You made my decision easy! Thanks!

        Economical, compact, light summer bag

        • Familiarity: I've used it several times

        Purchased this bag in a regular size as it was all they had at the local store. Reg fits to 6'0" which is an inch shorter than me, but its still a workable length. Small girth bag (60"/152cm), don't expect lots of room to move around in. I was in about 45F/7C temps overnight at 6,000'. With fleece pants and a long sleeved light shirt I was very comfortable. Not much loft, so the bag packs down very small and is very light. I don't have any issues at all getting it back into the stuff sack, I just stuff it in feet first without rolling it. I'm happy enough with it, exactly what I was looking for in a Summer bag at a really good price. ($89.00CDN)

        Stuffed into it's compression sack

        Not completely compressed, can go a bit smaller yet. Hat is there for size comparison.

        Stuffed into it's compression sack

        small but good

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

        I was deciding between this and the Marmot Maverick. Ultimately the weight won over. With that being said, it is sized compact. It fits my 5ft 7, 170 lb frame but with out a lot of wiggle room, but it does fit. In reality it will be mostly used unzipped and used as a quilt so the fit if fine for me.
        My biggest complaint is the stuff sack. I can't fit the bag back into the stuff sack it is so small. The stuff sack even has compression straps which could be used if it fit inside the stuff sack in the first place. The stuff sack is what dropped it a star.
        I don't expect any issues with warmth because its a summer bag and won't be using it for cold nights.
        So a nice, well priced, lightweight bag that fits snugly and has a hideously small stuff sack.

        The bag EASILY fits into the stuff sack if you don't roll or fold the bag first. Instead, stuff the sleeping bag into the sack starting with the toe of the bag and just keep stuffing. It can be done in about 30 seconds.

        I found the bag easily stuffed back into the compression sack - like Carla, I started at the toe, and just kept stuffing. Agree - 30secs tops. It compresses VERY well.

        Does what it says

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

        When it says 45 degrees, it is exactly that. My mistake was to not check the temp at night when I used it. I'm pretty sure it dropped down to 35, so it ended up being a tough night. But layer up or pack a liner and you're set.

        Very light and compact. Well worth it.

        Completely agree, Ryan. Especially on the 45 degrees part- I got caught out in the wind camping this fall, it really took the temperature down overnight, and that was a less than comfortable night's sleep. Ah well!

        Great lightweight bag for travel

        • Familiarity: I've put it through the wringer

        I picked one of these up while on travel through the mideast this year, as I needed something that was fairly light, packed down, and wasn't too warm- turns out that this is a perfect bag for warmer climates (though not too warm, unless you just want to lay on top of it).

        It is very light and packs down well with the included stuff sack.

        For the price, not bad at all. A piece of Marmot gear that does what it says it will. I've been sleeping in this thing every day for a good 4 months now, and very happy with it.