Hyperlite Mountain Gear Southwest 55 Review 2025 Version
Last Updated: August 13, 2025
By Jaeger Shaw
The New 100% Woven Dyneema Hyperlite Mountain Gear Southwest 55 Improves A Classic
This review of the 2025 version covers updates, pros, cons, and key competitor comparisons
Hyperlite Mountain Gear Southwest 55 is the most iconic ultralight backpack of all time, rereleased for 2025 with an improved version of 100% woven Dyneema Composite Fabric. It may not be the innovative market smasher of 15+ years ago, but it’s still an excellent performer after all this time; proven to be approximately as reliable as death and taxes.
- Price: $399
- Weight: 30.8
- Material: 100% Woven Dyneema
- HMG Peers: Junction. Windrider. Unbound. Waypoint.
- Primary Competitors: ULA Ultra Circuit. Durston Kakwa. Zpacks Arc Haul. Gossamer Gear Mariposa. Osprey Exos/Eja.
- Pros: Most iconic ultralight pack of all time. Dyneema fabric is waterproof, seam taped, and hyper durable. Large non-mesh external pockets protect contents, never snags. Simple design. Good buckles.
- Cons: No load lifters. No horizontal frame structure. Non-articulated, non-reverse pull hip belt. Expensive. No back panel aeration. Velcro roll-top closure snags.
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Editor’s Note on Volume Options: We recommend the HMG Southwest 55L (depicted in this review) by default, because it’s by far the most versatile size for most backpackers on most trip lengths. The 40L works for short trips and/or fully dialed in ultralight kits. The 70L is good for expedition-length food carries, winter backpacking, and full-size bear cans.
While you’re here, check out our HMG Unbound Backpack review, and don’t miss our buyers guide to ultralight backpacks, fastpacks, and ultralight daypacks.
Recommended: Bottle Pocket x2, or Bottle Pocket (x1) and Shoulder Pocket (x1)
Loaded up and ready to haul
Close up on new-for-2025, 100% woven Dyneema. Read more.
What changed with the new-for-2025 version?
Improved, 100% Woven Dyneema Fabric
The Hyperlite Mountain Gear Southwest 55 is no longer made with DCH (Dyneema Composite Hybrid) now you get DCF (Dyneema Composite Fabric), featuring a 100% woven Dyneema exterior; the most significant performance update for 2025. It’s 10x more abrasion resistant and 5x more tear resistant than the previous fabric (DCH), which was made with a non-Dyneema woven face fabric – hence the hybrid designation. This is a nice textile upgrade and we’re glad to see Avient (the company that owns Dyneema) back on the innovation train and competing with the like of Challenge ULTRA and ALUULA. That being said, durability was never a major concern with HMG packs, so this likely will not create a particularly tangible user experience improvement, even if the fabric geeks love it.
At time of publication, we don’t have info on how 100% woven DCF compares to Challenge ULTRA, but will update this review as we learn more. At first blush, both seem incredibly strong and are an excellent choice for packs.
Read more about this new version of 100% woven Dyneema directly from the source.
Widened Shoulder Straps
Holding up the 2025 Southwest to a 2019 Junction that we had on hand, the shoulder straps are clearly wider by a small but noticeable margin, perhaps ¼ or ⅓ of an inch. This is a good choice, as wider shoulder straps help disperse pressure; especially important considering the lack of load lifters.
Roomier External Pockets
Maybe we’re imagining it, but it seems like the expansion volume of the external front pocket increased, yielding even more storage capacity for day-use items. Thumbs up!
Better Straps
Closing things out, we note the improved ice axe strap top loop, the addition of external pocket daisy chain divider, and increased adjustability via assorted compression straps.
As above
So below
Expanded Pros of HMG Southwest 2025 Version
Most iconic, most proven ultralight pack…ever!
HMG Southwest is the most easily recognizable, best-selling ultralight pack on the market, and arguably of all time. It is inextricably linked to the explosion of popularity in ultralight gear, and is now even available at retailers like REI and Dicks Sporting Goods. It is the pack we used most from 2010-2020, and we’ve taken it all over the world, from Alaska to Patagonia and everywhere in between. Along with nearly ever satisfied customer, we trust this backpack completely, and no alternative has been more thoroughly tested.
Dyneema fabric is waterproof and durable
Because of their extremely high durability-to-weight ratio, ultra high molecular weight polyethylene (UHMWPE) composite fabrics, like Dyneema, are the best choice for backpacking packs. This new version combines a 100% woven face fabric overtop of two layers of perpendicular Dyneema fiber, over top of a waterproof film that keeps your gear dry. The fabric is waterproof and the pack is seam taped, but we still recommending using supplemental dry bags for your sleep system. And considering the non-mesh external pocket, burly buckles, and lack of fiddly features, Hyperlite Mountain Gear Southwest is practically indestructible.
Large non-mesh external pockets
We were really impressed by the storage capacity of Southwest’s front external pocket, now with even more volume via its 2025 update. Instead of mesh, Hyperlite Mountain Gear Southwest 55’s signature design feature is an entire suite of external pockets made with Ripstop. This is particularly advantageous as it never tear or snags like mesh, and protects the contents from abrasion when leaned against rough surfaces like granite. This is a major win if you like to use your pack as a backrest, and you don’t need to be in the desert to justify choosing a Southwest!
Large user friendly buckles
Simply put, HMG Southwest has large, secure, gloved-hand-friendly buckles. This makes it easier to use in the cold, and fast to open/close.
Simple
Simplicity is both a pro and a con of the Southwest 55. The lack of features keeps weight down and decreases the likelihood of component failure. When this pack was first launched, it was presented as an alternative to bulky, heavy, overly featured models available from mainstream competitors like Osprey. While advancements in ultralight pack design have yielded more fully-featured competitors in the same weight class, the simplicity of Southwest still means less fiddling, less breakage, and more backcountry joy.
The well-volumized front pocket holds tons of gear and protects it from abrasion
Expanded Cons of HMG Southwest 2025 Version
No load lifters
Perhaps the greatest drawback to Hyperlite Mountain Gear Southwest is the lack of load lifters, which decreases potential shoulder comfort at the heavy end of its recommended 40 lb load capacity. Many of HMG’s competitors now add load lifters to their ultralight packs, and while this does increase fuss and design complexity, we’re usually glad to have them for carrying loads up to or exceeding 25 lbs, and it’s extra important for those with less muscular traps.
No horizontal frame structure
Southwest’s beefy dual aluminum stay frame, which connects the hip belt to the shoulder straps, does a respectable job with weight transfer to the hips. However, there is no connection between the stays, not even a plastic frame sheet, meaning no horizontal stability whatsoever, and less structure. This means weight is less balanced between sides, and you might get more pressure on one shoulder than the other. In our experience, the packs with the best load transfer tend to utilize an inverted-U shaped frame, or a fully enclosed polygon, plus some kind of frame sheet. This adds strength and stability that Southwest lacks.
Non-articulated hip belt
The sewn-in hip belt is another example of HMG opting for minimalist design and increased reliability over comfort. This contrasts numerous other ultralight brands, such as Gossamer Gear Mariposa and Zpacks Arc Haul, which build their packs with “articulated hip belts.” An articulated hip belt is not sewn-in, but attached in a way that adds a few degrees of flex in order to accommodate and parallel the movement of your hips as you walk. Without an articulated hip belt, the pack body will move more with each stride. At time of publication, articulated hip belts are a fast growing trend, and generally considered to be a desirable feature.
Non-reverse pull hip belt cinching
The best hip belts utilize a reverse pull double webbing strap system. The reverse pull trait makes the arm angle and motion of tightening easier. Double straps yield a more refined, customizable fit. See ULA Ultra Circuit, Zpacks Arc Haul, and Durston Kakwa.
No back panel aeration
While back panel aeration is largely overrated and not a must-have feature (your back will get sweaty no matter what), it’s definitely a nice to have add-on that Southwest 55 does not have. Its flat Dyneema back panel is hotter than spacer mesh or a curved frame with taut/trampoline mesh. But if you’re considering this pack, don’t let this missing feature be a deal breaker; it’s not a big deal and other top performers, like Durston Kakwa, also don’t have an aerated back.
Velcro roll-top closure
This is a minor nit pick, but we don’t love the Velcro top closure. It adds an extra step to the open/close process, and really isn’t necessary considering how long the roll top extends above the body of the pack, with plenty of excess fabric to form a great seal. Furthermore, Velcro has a negative interaction with some fleeces, Polartec Alpha Direct, the best ultralight mid-layer, which we highly recommend wearing.
Old School
Back around 2010, the HMG Southwest was a best-in-class, market-smashing disrupter product made with new and exciting Cuben Fiber (later renamed Dyneema). Fifteen years later, it’s largely the same design as it always was, but with a slightly better version of Dyneema. Ergo, it’s still a great pack, but no longer the pinnacle of ultralight pack innovation.
Hyperlite Mountain Gear Southwest vs its Peers
HMG Southwest vs Windrider
This comparison boils down to mesh pockets vs solid fabric. Windrider’s mesh is slightly lighter weight, see through, and allows for ease of drying socks. Southwest’s solid ripstop fabric is more durable/longer lasting, and protects the contents from abrasion and light rain. It’s a much better choice if you frequently use your pack as a backrest Between Windrider and Southwest, we prefer Southwest. Dry your socks using the straps instead.
HMG Southwest vs Junction
Junction is equal parts Southwest and Windrider, with solid ripstop side pockets for durability, and a mesh front pocket for drying/visibility of contents. Between Windrider and Junction, we prefer Junction more because you don’t need visibility or aeration into the side bottle pockets. But again, we prefer Southwest to Junction because of how its fabric protects the contents of the front pocket and never snags.
HMG Southwest vs Unbound
While Southwest, Junction, and Windrider are different from each other only by external pocket material, Unbound is a different beast entirely and a smidge lighter weight – roughly two ounces. Structurally Unbound benefits from a back panel reinforced with a plastic frame sheet that adds horizontal stability, though it only has one aluminum stay vs Southwest’s dual aluminum stays. It has a similar-but-removable hip belt. All in all, weight transfer is likely comparable between these two, and they’re both rated to 40 lbs.
In terms of pockets, Unbound has larger, cinchable side bottle pockets, which we prefer to Southwest’s. It also uses a Dyneema stretch mesh front pocket, which is a better material. The thing is, HMG made that pocket a bit more taut than we’d prefer, such that Southwest’s static-but-highly-volumized ripstop front pocket is the superior of the two in terms of spaciousness. Unbound also gets a bottom pocket that’s good for storing a hat, or trash wrappers. The 2025 Southwest gets better fabric in the 100% woven Dyneema, but we assume they’ll upgrade Unbound soon enough. Between them, we have a slight preference towards Unbound, but neither is the clear winner and both are great packs.
HMG Southwest vs Waypoint
Waypoint 35 is a low volume fastpack, somewhat comparable to the Southwest 40, but much smaller than the 55. Waypoint is about half a pound lighter weight. It has built-in shoulder strap pockets (that are slightly too small in our opinion) while Southwest has daisy chain shoulder straps with better pockets sold separately. Southwest has a larger external front pocket, and better load transfer to hips due to its dual aluminum stays (Waypoint only has one stay). Between them, we prefer the Southwest 40 primarily because of the larger front pocket, but experts with super dialed in UL kits should feel free to downsize to Waypoint, if they can fit into a 35L pack and want more weight savings.
Hyperlite Mountain Gear Southwest vs the Competition
HMG Southwest Vs Durston Kakwa
- Advantage HMG Southwest: seam taped, better front pocket, simpler design, more proven.
- Advantage Durston Kakwa: load lifters, better frame and weight transfer, comes with built-in shoulder strap pockets, less expensive, one tall side pocket with bonus zip pocket
- Tie: New 100% woven DCF is comparable to Challenge ULTRA, both fabrics are waterproof and durable. Approximately same weight.
HMG Southwest Vs ULA Ultra Circuit
- Advantage HMG Southwest: Lighter weight. Simpler design. More proven. Sits upright when full. Taller roll top collar. Seam taped.
- Advantage ULA Ultra Circuit: Load lifters. Larger front pocket, better stretch material, better back panel and frame.
- Tie: New 100% woven DCF is comparable to Challenge ULTRA, both fabrics are waterproof and durable. Same price.
HMG Southwest Vs Zpacks Arc Haul
- Advantage HMG Southwest: More durable. Simpler design. More proven. Better exterior pockets. Taller roll top collar. Less expensive.
- Advantage Zpacks Arc Haul: Lighter weight. Load lifters. Better weight transfer. Curved frame aerates back.
- Tie: New 100% woven DCF is comparable to Challenge ULTRA, both fabrics are waterproof and seam taped.
HMG Southwest Vs Gossamer Gear Mariposa
- Advantage HMG Southwest: Waterproof, seam taped, hyper durable Dyneema fabric is far superior to Robic Nylon. Durable exterior pocket fabric doesn’t snag and protects contents from abrasion. Two ounces lighter.
- Advantage Gossamer Gear Mariposa: Load lifters. Articulated hip belt. Less expensive. More external pockets, one extra deep side pocket. Sit pad back panel. Fun colors.
- Tie: Both are totally classic and proven ultralight packs.
HMG Southwest Vs Osprey Exos / Eja
- Advantage HMG Southwest: Lighter weight. More durable. Simpler design is less likely to fail. More proven. Far better exterior pockets. Roll top without brain. Fabric is waterproof and seam taped.
- Osprey Exos/Eja: Better weight transfer. Load lifters. Aerated back. Less expensive.
- Tie: Nothing.
Conclusion: Hyperlite Mountain Gear Southwest 55 backpack review, 2025 edition
HMG Southwest 55 is no longer the pinnacle of innovation that it once was, yet it remains the most proven, trusted, longest lasting, best selling ultralight backpack on the market; still among the top 1% of performance options after all these years. The upgrade to woven Dyneema face fabric keeps it competitive with Challenge ULTRA packs, but a lack of key comfort features, like load lifters, has it just on the outside of the top ten looking in. All said and done, we salute the Hyperlite Mountain Gear Southwest as an absolute icon, a pack we still recommend highly and that you’re sure to love, now more than ever!
