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Hyperlite Mountain Gear Southwest 55 Backpack

A pack for backpacking in dense, heavily wooded trails in the roughest, toughest climates. 55+10 l.

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911 g Weight in grams. We check the weight of almost all items thus our weight information is often more precise than the one given by manufacturers.
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 424.50 (  350.83 excl. VAT)

Product information

The Hyperlite Mountain Gear Southwest 55 (formerly 3400 Southwest) is a waterproof ultralight pack with exceptional mechanical durability. It is especially suitable for shorter treks through difficult terrain (rocky, scrubby, dense forests). On rainy days you don't have to worry about a raincoat on your pack.

American-made Hyperlite Mountain Gear backpacks (made in the USA and Mexico) have long been among the top-rated backpacks on the PCT. We recommend the Southwest 40 especially for shorter hiking trips, when you'll appreciate the ample interior (55L) and exterior (10L) space and the pack's high durability.

A smaller version of this pack is the Southwest 40 (40+10 l). The only difference in volume is the greater ability to roll the 55 version up. The Southwest 55 is therefore more versatile - you can easily roll it up to the Southwest 40 size.

Thanks to the DCF (Dyneema® Composite Fabric) material used, it is a top choice among ultralight backpacks in terms of durability and longevity. This makes the backpack worth buying for longer and more intensive use, despite its higher price. In addition, any tears in the material are easily repaired with a self-adhesive kit. The black version of the backpack is made of a higher weight fabric. It is therefore about 100 g heavier, but even more durable.

The back system is reinforced with aluminium reinforcement, which helps to transfer the load to the waist belt. This makes the backpack easy to carry even with heavier loads (up to 18 kg).

Although we label the pack as waterproof, we recommend using it in combination with Hyperlite Mountain Gear bags and pouches. DCF fabric alone will not shed water. Most of the seams, which are minimal due to the construction of the pack, are taped. There are two unsealed areas on the pack. The seams that hold the shoulder straps cannot be taped due to too much stress on the seam. The reinforced seams on the bottom of the pack are also not. The pack can withstand short-term rain with no problem, but in long-term rain, moisture can get in just through the seam of the shoulder straps. Don't put it in a puddle with the bottom down (a quick swim in a river, for example, will get minimal water into the pack if you roll the lid up properly). The fabric is non-absorbent and dries very quickly.


DCF is a non-woven rip-stop composite laminate. Extra strong Dyneema® fibres are laminated between two layers of polyester. Other so-called hybrid variants are derived from this base. In these, a woven polyester fabric is added to the outside of the laminate to further increase the overall durability of the laminate. These fabrics are labeled DCH50 and DCH150, where the number indicates the grammage of the woven fabric (50D, 150D). Hyperlite Mountain Gear backpacks are made from these fabrics.


  • removable aluminium internal reinforcement
  • integrated foam back pad
  • fixed straps with loops for attaching additional gear (daisy chain)
  • chest belt with whistle and the option of attaching an additional Versa pocket or a smaller Vice Versa


  • main compartment with compartment on the back for hydrovac
  • front full-length large pocket with drain hole
  • two fabric side pockets
  • two waterproof zipped pockets on the waist belt


  • roll-up lid - roll up 3 times for sufficient waterproofness, plus you can regulate the overall volume of the backpack
  • top handle on the lid, e.g. for attaching a mattress
  • 4 loops on the backpack for possible placement of additional lanyards (not included)
  • trekking poles can be carried in one of the side pockets
  • side compression strap


Accessories can be purchased with the backpack. Not included.


Have the length of your spine measured from the level of the iliac crest (the top of the bone on the side of your back) to the C7 vertebra at the base of your neck. This is the top of the first protruding vertebra when the head is tilted.

  • Length <38 cm = size XS
  • Length 38 - 43 cm = size S
  • Length 43 - 48 cm = size M
  • Length 48 - 53 cm = size L
  • Length 53 cm and over = Tall size

If you measure your back length, choose the larger size. For example, for a back length of 48 cm, choose size L


Volume 55+10 l
Height up to 95 cm fully unrolled
Width 34 cm
Depth 18 - 25 cm
Maximum load 18 kg
Back length 38 - 43 cm (S)
43 - 48 cm (M)
48 - 53 cm (L)
53 cm + (Tall)
Material DCH50 (white - 50D face fabric)
DCH150 (black - 150D face fabric)
Weight 875 g (S)
903 g (M)
930 g (L)
942 g (Tall)
955 g (S)
980 g (M)
997 g (L)
1010 g (Tall)
(weighed in Pod 7 kilo)


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