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Hyperlite Mountain Gear
Southwest 55L Backpack

5 out of 5 stars
3 Reviews


Size Chart


Why We Like The 3400 Southwest 55L Backpack

For warm backpacking adventures, we like to hike in with all our camping gear in Hyperlite Mountain Gear's 3400 Southwest Backpack. Despite its ultralight weight, the Southwest is surprisingly comfortable and durable enough for long hikes. Its Dyneema Hardline suspension system includes spacer mesh foam for breathable comfort, and there are supportive aluminum stays that we can remove for even less weight. Hyperlite Mountain Gear made this pack out of the same Dyneema rope fabric used to catch climbers when they fall, so you know it'll last for seasons.


  • Ultralight pack for warm-weather backpacking
  • Dyneema Hardline suspension system lifts the load
  • Removable aluminum stays provide rigidity
  • Padded, spacer mesh offers breathable cushioning
  • Roll-top closure and fully taped seams seal out precipitation
  • Hydration-compatible sleeve and port make water access easy
  • External Dyneema pockets secure frequently needed items
  • Top and side compression straps eliminate excess space
  • Item #HMG0006
55L (3356cu in)
Dyneema Hardline, removable aluminum stays, padded back panel
Shoulder Straps
sewn-in spacer mesh, 3/8-inch foam
Waist Belt
yes, 1/8-inch foam, 3/8-inch foam, spacer mesh
Hydration Compatible
yes, internal sleeve, port
3 exterior, 2 zippered waist belt
Ice Axe Carry
yes, top and sides
10.5 x 34in
Claimed Weight
[white] 2lb, [black] 2lb 1oz
Manufacturer Warranty
1 year

Overall Rating

5 based on 3 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 0 reviews
4 Stars - 0 reviews
5 Stars - 3 reviews

Fits True To Size

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


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5 out of 5 stars

December 10, 2023

Great lightweight pack

I've used it once or twice and have initial impressions
Size Bought:
5' 10"

High quality and well made. This is the backpack if you need something that is simple, ultralight and waterproof. It is a roll-top bag so not as convenient as one with a zipper opening which allows full access to the contents without pulling everything out but is is likel half the weight The seams of the pack are the only areas where water could penetrate. The 55l provides additional flexibility to expand when you have a larger loadout but can be rolled down to 40l if you don't need the extra space.

Melissa M
5 out of 5 stars

October 9, 2020

Best Backpack I've ever Owned

I've used it several times
Size Bought:

I'm in love with this pack. The material is super durable. The build quality is amazing. I love the versatility of the roll top. There are two small things I don't like about it, which I wouldn't knock it for, as these things might work fine for some people. 1) The port for the hydration reservoir tube is slightly low and the pack is large so you need a really long tube. 2) The addition of one top stow pocket for quick access items like your keys or headlamp would have made it perfect. You can use the belt pouches but I would have liked one more pocket. Overall though, great pack. Super light and comfy.

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Jeremy P
5 out of 5 stars

July 13, 2020

BOOYAH! SW 3400 For the Win!

I've put it through the wringer
Size Bought:
5' 11"

I'm in my 3rd season with the Southwest 3400 and am still stoked on it! I had been trending lighter in my setup for awhile but some low back issues prompted me to attack the Big 4 hard. I was a little concerned about the lack of padding in the shoulders and hips (I've had issues there before), but whether due to the overall decrease in my pack weight or just brilliance in engineering, I haven't had any problems. In fact, the overall fit and comfort of this pack surpasses all the other expensive, overkill packs I've had. I've adapted to the minimalist aspect of no internal pockets/organization. The external pockets are quality, and I don't mind the slight uptick in weight for their durability vs mesh alternatives. The 3400 is a great size. I haven't gone beyond a 4 day trip in it, but I have no doubt I could go much longer. On my typical 3-4 day solo outings, I don't have to lash anything to it and have extra space inside the roll-top. I keep my 5-section Z-lite on one side pocket with my Tenkara rod, my river/camp sandals and daily snacks/needs in the back pocket, my Be-Free filter fits into one hip pocket and my extras/phone (Sony xperia compact; probably won't fit much larger) in the other. I added a water bottle sleeve (from Zpacks) to the shoulder strap and now I have one side pocket for more goodies! I don't carry a daypack anymore because the SW can roll and strap down small enough (and its more comfortable than some cheap sack!) to make a summit run or daytrip with ease! Weather: Best test yet was a thunderstorm this year. I hit a couple cells without much coverage and no moisture got inside at all. It also rained that night (unexpectedly), and I awoke in the early AM with the SW in a small puddle in my vestibule; again, no moisture inside. No regrets! Highly Recommend!

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Travis C