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Mountain Hardwear MTN Speed 32 Review

Ultralight Sleeping Bag

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Price:   Varies from $350 - $360 online  —  Compare at 2 sellers
Pros:  Superlight, comfortable hood seals in warm air, warm for back sleepers
Cons:  Poor warmth for side sleepers, zipper catches and separates easily, slim cut is for skinny people only
Editors' Rating:     
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Manufacturer:   Mountain Hardwear


The Mountain Hardwear MTN Speed 32 is an incredibly light hooded mummy bag, weighing in at just 16 ounces. This bag combines top of the line down with some of the lightest weight shell fabric and a very slim cut to attain its extremely light weight. Unfortunately, two main drawbacks limit its usefulness for ultralight hikers. First is the zipper, which is prone not only to snag, but also to separate. Indeed, on the first night of our first test trip with the Mtn Speed, the zipper hung up, and then separated, becoming non-functional for the remainder of the weekend. In our opinion, this is a fatal flaw. In addition, sewn-through quilted construction on the bottom of the bag limits the warmth for all but back sleepers.

Even though it is two ounces heavier, we think the Western Mountaineering Summerlite is a much better choice for ultralight backpackers who prefer a hooded mummy. It is warmer for side and tummy sleepers, and it features a smooth operating, durable zipper. You'll find several more very light hooded mummies in our review of Backpacking Sleeping Bags.

RELATED: Our complete review of ultralight sleeping bags

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Analysis and Hands-on Test Findings

Review by:
Brandon Lampley
Review Editor

Last Updated:
November 1, 2015
The Mountain Hardwear MTN Speed 32 is one of the lightest products we evaluated in our Ultralight Sleeping Bag Review. It delivers a lot of warmth for the 16 ounce weight, but the cut is too slim for most hikers to wear their warm layers to bed on cold nights. In addition, with only a 32" side zipper, we feel this is the least versatile bag tested this year.

Performance Comparison

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There's only one sure way to compare products: side-by-side...and that's what we do. Brandon is getting set to spend half the night in the Western Mountaineering Summerlite (on the right), and the other half in the Mountain Hardwear Mtn Speed (on the left). We tested several styles of bags, and made sure to compare the most similar models closely. Zipper details make all the difference with these two similar bags.


For our thin testers who sleep still on their backs, this bag is just a little warmer than the Western Mountaineering Summerlite. But for most of us, the Summerlite's additional girth also means we can wear our insulated jacket on colder nights without compressing the insulation. And the Summerlite has continuous baffles that are warmer for side and tummy sleepers. In short, we find the Summerlite (the competitor most similar to the Mtn Speed) warmer in practice for most backpackers. If warmth at a very light weight is your focus, we found that both the Katabatic Gear Palisade 30 and ZPacks 20 Degree have better warmth-to-weight ratios.

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The Mountain Hardwear MTN Speed 32 weighs 16.0 oz (left) and the ZPacks 20 Degree (right) weighs 17.2 oz. Notice the dramatic difference in loft! Eliminating a hood and draft tube allows ZPacks to be very warm for minimal weight.

Weight & Packed Size

On our digital scale, this mummy bag weighed in at exactly 16 ounces and the included stuff sack a half ounce. No doubt, this is impressively light for a bag this warm. As we understand it, Mountain Hardwear designed the Mtn Speed as a just-in-case bag for light and fast alpinists. Considering most alpinists will likely be carrying a warm down parka, we'd recommend carrying the similarly light Feathered Friends Vireo on alpine missions where you may or may not have to bivy.

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This model weighed in at 16.0 ounces on our digital scale, and stuffs down quite small. We'd prefer a cotton storage sack to the included mesh one.


We find this to be the least versatile product in our ultralight review. The partial length zipper limits your ability to open it up for hot nights and the narrow girth limits your ability to wear warm insulating layers on cold nights. For ultralight backpackers, we believe quilts, and especially fully-opening ones, are the most versatile sleep option. Our Best Buy award winner, the Enlightened Equipment Revelation 20 earned the highest versatility score we awarded.


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This mummy bag received one of the lowest comfort scores, and it would have been lower still were it not for the comfortable hood and face opening. Actually, the hood is one of the highlights of this mummy it has a down-filled baffle that is comfortable on the face when cinched up tight. Even though you may not need the added length, all but the thinnest of backpackers should opt for the long version of this bag due to its 4 inches of additional girth at both the shoulders and hips. You'll have a little more room to move around and add warm layers.


This mummy bag uses a 32" #3 zipper that is backed by a small draft tube. As we've noted, the poor function of this zipper is this model's main drawback. The hood closure of this bag stands out as very functional and comfortable. Independent cinch cords for the brow and lower part of the opening allow fine tuning and the down-filled baffles here are warm and comfortable.

This mummy uses one of the lightest shell fabrics out there and high quality water resistant down. Horizontal baffles on the top contribute to its warmth, and sewn-through quilting on the bottom saves weight. Unfortunately, the end of the footbox is also sewn-through. We were surprised not to see box baffles here. Two small hang loops sewn into the foot are a nice feature.

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This model has an awesome and comfortable hood and a face opening with independent brow and chin cinch cords.

Best Applications

We do not recommend the Mountain Hardwear MTN Speed for ultralight backpackers, primarily because of concerns about the function and durability of the zipper. Some folks do love it enough to have the zipper replaced right from the start. If you do, this would be a good choice for thin backpackers who are back sleepers and want the lightest possible hooded mummy bag.


The Speed 32 retails for $480 but can often be found for less. Even on sale, we feel there is better value to be found elsewhere.


The Mountain Hardwear MTN Speed 32 is an impressively light mummy bag with a serious issue… the zipper is prone to snagging. Indeed, it snagged and then separated on our first test weekend.

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Testing side-by-side with the Hammock Gear Burrow.

Sizing, Accessories, & Other Versions

Regular 76ʺ, Long 81ʺ
The long version has 4" more girth at the shoulder and hip.

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Mountain Hardwear Phantom 0
  • Cost - $580
  • Rating - 0 degrees
  • Q-Shield - water resistant down and outer material
  • Weight - 2lbs 9oz
Brandon Lampley

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Most recent review: November 2, 2015
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1 of 1 people found the following review helpful:
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   Nov 2, 2015 - 11:14am
Nkofahl · Climber · Albuquerque
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Zipper replaced by MH Warranty.

I've had this bag for about 9 months and used it in a variety of conditions. The warmth, weight, and packability of the bag are top notch. My one complaint was that the zipper was really painful to use.

At no point during my use did it become "non-functional" but the little fabric ribbons that protect the ghost fabric would commonly get stuck in the zipper. If you were in a hurry with the zipper i could see how you could create quite a jam. I learned to take great care in zipping this bag; usually this required a finger near the teeth of the zipper to hold the fabric away.

Honestly this was a pain in the rear and while it was something i was willing to put up with for the other features of the bag, I was not happy with the overall experience. After a season of use I contacted the MH warranty department. They were understanding and very easy to work with. They requested I send the bag back to them and they replaced the zipper and fabric that protects the rest of the bag. The results are nothing short of outstanding. For a very small weight gain, I have one of the best zippers I've ever had on a sleeping bag. I no longer even give thought to zipping this bag and I didn't really give up any of the positive aspects of the bag.

MH could probably have made this bag even better if it were a quilt, or if the bottom was designed a little differently, but with the upgraded zipper on my unit, and MH standing behind their product, I am very, very happy.

Bottom Line: Yes, I would recommend this product to a friend.
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