Hyperlite Mountain Gear Southwest 55: Weight, Price and Alternatives

The Hyperlite Mountain Gear Southwest 55 is our expert tier pick in backpacks, with a published weight of 2 lb 0 oz and a listed price of About $400. Dyneema Composite Fabric, seam-taped, effectively waterproof, and the pack that made ultralight packs a mainstream category. It has no lid and very little structure, which is the trade.

What is the Hyperlite Mountain Gear Southwest 55 actually good at?

Dyneema Composite Fabric, seam-taped, effectively waterproof, and the pack that made ultralight packs a mainstream category. It has no lid and very little structure, which is the trade.

Best for: A base weight already under about 14 lb. Overload a frameless or lightly framed pack and it carries worse than a cheap one.

A pack is the one Big Three item that gets worse when the rest of your kit is heavy. Frameless and lightly framed packs carry beautifully under about 25 pounds and badly over it, so the honest order of operations is to cut the load first and buy the pack second.

What does it do to your base weight?

At 2 lb 0 oz this item accounts for roughly 20 percent of a 10 lb ultralight base weight and about 10 percent of a 20 lb traditional one. That framing matters more than the raw number: an ounce saved on a headlamp is noise, and a pound saved on a shelter is a category of its own. Put your real figures into the gear list builder and the same item will show you what it costs against your list rather than against an average one.

Published weights are taken in the manufacturer's favour: usually the smallest size, usually without the stuff sack, stakes or guylines that come in the box. Expect a real-world figure an ounce or two heavier and weigh it once when it arrives. A $9 kitchen scale is the cheapest useful upgrade to any gear list, because it stops the spreadsheet lying to you.

How does it compare with the rest of the backpacks?

Every item below has been verified against the retailer listing, and every weight is the manufacturer's published figure for the configuration named. Sorted lightest first, so the trade between weight and everything else is visible in one pass.

Lighter alternatives: Zpacks Arc Haul Ultra 60 at 1 lb 5 oz. Heavier but more capable: Granite Gear Crown3 60L Backpack at 2 lb 3 oz, Osprey Exos 58 Ultralight Backpacking Pack at 2 lb 10 oz, Naturehike Rock 2.0 60L Internal Frame Pack at 3 lb 5 oz. Weight alone never decides this. The lightest option in a category is usually the one with the narrowest window of conditions it works in, which is exactly the trade the roundup spells out tier by tier.

Does this weight include the lid and the frame?

Pack weights are quoted for one size, usually the smallest, and often with the lid, the framesheet or the stays removed, because those parts are removable and removing them makes the number smaller. A larger torso size can add several ounces. More importantly, a pack has a design load: frameless and lightly framed packs carry well up to roughly 25 lb total and progressively worse above that, and past about 30 lb the load moves onto your shoulders. Total means base weight plus food, water and fuel, so check the loaded number rather than the base weight before deciding a light pack will work.

What does the weight saving cost per dollar?

Gear upgrades get argued in adjectives. They are better argued in a ratio. Against the heaviest priced option on the same shelf, the Naturehike Rock 2.0 60L Internal Frame Pack at 3 lb 5 oz and $129.99, this item saves 21.0 oz for about $270.01 more, which works out at 2.2 grams saved per dollar spent.

Use that number the way you would use any ratio, which is as a sanity check rather than a verdict. Anything above roughly 5 grams per dollar is excellent value in this hobby. Under about 1 gram per dollar you are buying something because you want it, not because the arithmetic told you to, and that is a perfectly good reason as long as you know which one you are doing. The ratio also ignores everything that is not weight: durability, fit, repairability and how well an item works in the conditions you actually hike in are not in the numerator, and any of them can outweigh the whole calculation.

Which complete kits use it?

This item appears in one of the complete gear lists on this site, which is the most useful context a single product page can give you: not what it weighs in isolation, but what share of a finished kit it accounts for and what the rest of that kit looks like around it.

Every one of those kits lists every item you need to actually go, with a per item weight and price, a running total down both columns, a section on what you can skip, and an upgrade ladder priced in grams saved per dollar. Each also loads straight into the gear list builder so you can swap this item for something you already own and watch the total move. That is usually a faster way to decide whether a purchase is worth it than reading another review of it.

Who should skip it?

Anyone buying their first version of this item. Expert tier gear is specialised, and specialised means it is better at a narrower set of conditions rather than better at everything. Buying it first usually means discovering an expensive preference rather than confirming one.

Going lighter must not mean going unprepared. Shelter adequate to the actual conditions, insulation, rain protection, water treatment and a way to call for help are fixed costs on any list. If a lighter version of this item means cutting into one of those, it is the wrong purchase however good the spec sheet looks. You are responsible for what you walk into, and the forecast is not the conditions.

Related reading

• Our full backpacks roundup, split into beginner, intermediate and expert tiers
• Pack volume by trip length
• Frameless versus framed packs
• Gear list builder: see what this item does to your own base weight
• Base weight calculator
• Six complete example gear lists, every item priced and linked
• All verified gear specs, A to Z