Comparison · Packs
Updated October 5, 2026
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Decides on → More padded vs Spare
Ultralight hikers who still want a hip belt
Not sold on Amazon US.
Closest on Amazon: Osprey Exos 58 Ultralight Backpack (men's). A widely sold ultralight pack of about 58 liters in a similar price band to the Mariposa.
Check current price on the listing.
Hikers who want a waterproof pack and will pay for it
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| Gossamer Gear Mariposa | Hyperlite Mountain Gear Southwest | |
|---|---|---|
| Comfort | More padded | Spare |
| Rain | Use a liner | Highly water resistant |
| Pockets | Yes | Minimal |
| Price | Upper mid | Premium |
| Heavy loads | No | No |
| Best for | Long trails with a dialed kit | Wet-country simplicity |
A long-trail favorite for hikers whose base weight is already under control.
Not sold on Amazon US.
Closest on Amazon: Osprey Exos 58 Ultralight Backpack (men's). A widely sold ultralight pack of about 58 liters in a similar price band to the Mariposa.
Check current price on the listing.
A DCF pack that keeps rain out and expects you to pack like a thru-hiker.
The Mariposa is the easier pack to live with. The Southwest is the specialist. Neither forgives a heavy kit.
The Mariposa is comfortable with a disciplined load and miserable as a suitcase. If you are still carrying a 5-pound tent and a chair, buy a Crown or an Atmos first. The hip belt is the point. Frameless packs are a later experiment.
Who should buy it. Experienced hikers with a light kit.
Best for. Ultralight hikers who still want a hip belt
Limitation. Overload it and the frame complains
About 2 lb · Upper mid
The Southwest is a roll-top DCF pack for hikers who already pack like they own one. There is no trampoline back and not much forgiveness if the load is heavy or sloppy. Rain stays out better than it does in a standard nylon pack, which is the reason to pay for it. If you want lid pockets and organization, the Osprey Atmos AG 65 or the Gregory Baltoro 65 will annoy you less. If you want a lighter framed pack while you are still learning what to leave at home, the Gossamer Gear Mariposa still has a hip belt and a less harsh carry. The Southwest isn't sold on Amazon US, so there is no buy button for it here. We don't swap in a different pack.
Who should buy it. Experienced hikers in wet country whose kit is already simple enough for a roll-top.
Best for. Hikers who want a waterproof pack and will pay for it
Limitation. Price, and a harsh carry if overloaded
About 2 lb 1 oz · Premium
Yes in the Mariposa. In the Southwest it is still wise for a river crossing.
No. Buy a Crown or a Flash.
These summaries come from the linked roundups, so the facts match across the site. Nothing here is a new test or a new score.
An ultralight pack is for a kit that is already light. The Gossamer Gear Mariposa is the comfortable default with a hip belt. The Hyperlite Southwest is the waterproof simple pack. The Kakwa 55 is the framed pack for hikers who want structure without a trampoline.
Hikers who have already cut the heavy tent, the chair, and the extra shoes. Not a first pack.
Picks are chosen for how you will use them, not by a private lab score. Weights and ratings are the manufacturer’s published figures and can change with the model year. Prices are not listed. Open the current listing before you buy.
Default on that page. Buy the Mariposa if you want pockets and a hip belt. Buy the Southwest if rain is the problem and you pack a simple kit. Do not buy either to carry a 40-pound load.
Fit the torso before you compare pockets. For hot miles and a normal load, the Osprey Atmos AG 65 is the ventilation example. For a pack you live out of, the Gregory Baltoro 65 is the organization example. The Deuter Aircontact Core 60+10 is the load-hauling example. The Granite Gear Crown3 60 is the lighter framed pick when you do not need a trampoline back panel. Ultralight cottage packs are on the ultralight packs page. Daypacks are on the daypacks page.
Hikers choosing a multi-day framed pack. Women's fits are different model names. Not an ultralight cottage-pack list and not a daypack list.
Picks are chosen for how you will use them, not by a private lab score. Weights and ratings are the manufacturer’s published figures and can change with the model year. Prices are not listed. Open the current listing before you buy.
Default on that page. Try two packs loaded with about 25 pounds. Buy the one whose torso length is right. Ignore features if the hip belt misses your iliac crest.
Torso fit, ventilation, and volume. A 65-liter pack is the wrong answer for a lot of first nights.
The harness fits the torso, not the liter number. A pack that is the right brand and the wrong back length will hurt by mile six no matter the reviews. Load it with about 20 to 25 pounds in a shop if you can.
Volume should match the sleep system you already own. A bulky 20°F bag and a wide pad need more pack than a quilt and a slim pad. Extra empty volume becomes extra gear.