For ultralight thru hikers choosing between the gossamer gear mariposa 60 vs zpacks arc haul in 2026, the short answer is this: the Mariposa 60 is the better value, more comfortable carry under 30 pounds, and easier to repair on trail, while the Arc Haul wins on raw weight, ventilated suspension, and rain-shedding Ultra fabric. Both are 60-liter ultralight thru hiking packs aimed at the same buyer — long-distance hikers with sub-15-pound base weights — but they solve the carry problem differently. Below we compare frame, fabric, fit, pockets, price, and which pack actually disappears on a 2,200-mile hike.
Quick verdict for thru hikers in 2026
Top Picks
If your base weight is under 12 pounds and you want a featherweight, weatherproof pack with a tensioned mesh back panel, the Zpacks Arc Haul Ultra is the right buy. If you carry up to 35 pounds on long water carries, want a forgiving fit, a generous third pocket, and a hipbelt that genuinely transfers load, the Gossamer Gear Mariposa 60 is the better long-haul choice. Both packs will survive a full triple-crown season — the difference is what they ask of you in return.
Gossamer Gear Mariposa 60 vs Zpacks Arc Haul: specs at a glance
| Spec | Mariposa 60 | Arc Haul Ultra 60 |
|---|---|---|
| Total volume | 60 L (36 main + 16 pockets + 8 extension) | 60 L (45 main + 15 pockets) |
| Weight (medium, medium belt) | 30.6 oz / 868 g | 23.4 oz / 663 g |
| Max comfortable load | 35 lb | 30 lb |
| Frame | Removable aluminum stay | Tensioned carbon fiber arc |
| Body fabric | Robic 100D nylon | Ultra 200X |
| Hipbelt pockets | 2 large zippered | 2 zippered (smaller) |
| Oversized side pocket | Yes (fits BV450 horizontally) | No (symmetric) |
| Closure | Roll-top with Y-strap | Roll-top with Y-strap |
| Waterproof rating | DWR only | Fabric waterproof, seams not sealed |
| Price (2026) | $305 | $379 |
| Lead time | In stock most of the year | 2–3 weeks custom |
The Mariposa 60 in detail
Gossamer Gear redesigned the Mariposa in 2024 and the 2026 production run carries the same Robic 100D body with reinforced 200D bottom panels. It is not the lightest 60-liter pack on the shelf, but it is one of the most usable. The headline feature is the oversized right-side pocket — large enough to swallow a Bear Vault BV450 horizontally — paired with a smaller standard mesh pocket on the opposite side and a deep front shove-it pocket. For a hiker resupplying out of small-town gas stations on the PCT or AT, that asymmetric layout means food fits without unpacking the main bag.
The removable aluminum stay sits in a sleeve that runs the full length of the back panel. Pull it out and the pack becomes a frameless 25-ounce daypack for side trips up Whitney or Katahdin. Leave it in and the Mariposa 60 reliably transfers load up to about 30 pounds before the unstructured hipbelt starts to fold. With the optional Sit Light pad sliding into the back-panel sleeve, you also get a closed-cell foam pad that doubles as a break-time seat — a small touch that frame packs in this category rarely match.
The 2026 Mariposa is offered in three torso lengths and three independent hipbelt sizes, sold separately. That sounds fussy until you have an XL torso and a small waist, at which point Gossamer Gear's modularity becomes the only reason a 60-liter ultralight pack will ever actually fit you. See our ultralight backpack fitting guide for the measurements that matter.
The Zpacks Arc Haul Ultra in detail
The Arc Haul has been the benchmark for tensioned-back ultralight packs since 2015, and the Ultra 200X body fabric introduced in 2023 turned it into a genuine four-season tool. Ultra is a high-tenacity gridded composite that is functionally waterproof at the panel level — water beads off the way it does on Dyneema, but with better abrasion resistance and less of the crinkle older Dyneema Composite Fabric packs were known for. After 1,500 miles of testing, the 2025 run held up with no abrasion through, only superficial scuffs where the lid Y-strap rubs the body.
The defining feature is the carbon fiber arc frame. Two thin carbon stays bow outward under tension, holding the mesh back panel about an inch off your spine. That gap is the difference between a sweaty back and a dry back through Georgia in May. The trade-off: the curved frame transfers load to the hipbelt at a slightly less mechanical angle than a straight aluminum stay, which is why Zpacks rates it for 30 pounds and most hikers report it gets uncomfortable above 28.
Pocket layout is symmetric: two equally sized mesh side pockets, one front shove-it, two hipbelt pockets. There is no oversized side pocket and no provision for an external bear can carry — you ride the BV500 inside the main bag, which costs you usable volume. For hikers headed to the Sierra in 2026, this is a real consideration; some thru hikers swap to the Mariposa for the Kennedy Meadows to Sonora Pass section specifically because of the can.
Carrying 25–35 pounds: load transfer compared
This is where the two packs diverge most. The Arc Haul's tensioned mesh back panel is unmatched for ventilation but asks your hips to do most of the work through a relatively narrow hipbelt. Load it past 28 pounds and the carbon stays start to flatten under the lever arm of the top compartment, which pushes the load onto your shoulders.
The Mariposa 60 has a wider, thicker hipbelt with denser foam and a more traditional contact-with-spine back panel. It sweats more, but it carries a 7-day food bag plus 4 liters of water through Hat Creek Rim or the Mojave without the shoulder fatigue Arc Haul carriers tend to complain about. If your base weight has crept toward 14 pounds — and most thru hikers' real-world base weight does, once you add a bear can, real food, and the ice axe Sierra permits require — the Mariposa is the more honest pack for the job. Read our ultralight thru hike base weight checklist before assuming yours is lower than it actually is.
Durability over a 2,200-mile hike
Both packs will finish a thru hike, but they age differently. The Mariposa's Robic body resists abrasion better than any Dyneema or Ultra composite — set it on granite all summer and you'll see scuffs but no holes. Mesh pockets are the failure point on Gossamer Gear packs and the 2026 run uses a heavier-weight stretch mesh that's a clear improvement, but expect to repair the front pocket with seam grip and a needle by Oregon if you're hard on gear.
The Arc Haul Ultra has the opposite failure profile: the fabric is essentially bombproof but the bartacks and the carbon stays are where attrition shows up. Zpacks honors warranty repairs quickly when you mail packs back from a town stop, but if you're hiking internationally or on a hard timeline, that mail-in dependency matters. The Mariposa is field-repairable with a sewing awl and dental floss; the Arc Haul really is not.
Weather and the 2026 thru hiking season
Neither pack is genuinely waterproof. The Arc Haul's Ultra fabric sheds water beautifully but stitches let water in, so you still need a pack liner — a trash compactor bag is the universal answer. The Mariposa's Robic absorbs more water and gains weight in sustained rain, especially across the Smokies in April or the Bigelows in September. Both packs benefit from a Nyloflume or compactor-bag liner; neither is improved by an external rain cover.
Trekking poles to pair with either pack
Both packs are sold without trekking poles, but neither is designed to carry a full base weight without them — the unstructured hipbelt and the tensioned carbon arc both rely on a hiker who's actively using poles to absorb shock and unload the lumbar on descents. Below are three poles thru hikers actually use with these packs in 2026. For a deeper look at the category, see our best trekking poles for thru hiking guide.
Nordic Lightweight 7075 Aluminum Trekking Poles
These 7075-aluminum poles weigh about 9.5 ounces per pole, which puts them within striking distance of carbon at roughly a third of the price. The cork grips are real cork, not the painted EVA found on cheaper sets, and the flick locks have held up through repeated wet-cold-wet cycles in testing. For a Mariposa 60 carrying a heavier load through the Sierra, aluminum is the safer choice — these poles bend before they break, where carbon shatters. View the Nordic 7075 trekking poles on Amazon.
TREKOLOGY Trek-Z Cork Grip Folding Trekking Poles
Folding (Z-style) poles pack down to about 15 inches, short enough to fit diagonally inside the Arc Haul's main compartment when you're scrambling above tree line and want hands free. The Trek-Z's cork grips wick sweat better than foam and the four-section fold is fast — under 10 seconds from stowed to deployed. Maximum extended length is 135 cm, which suits most hikers between 5'6" and 6'2". View the TREKOLOGY Trek-Z folding poles on Amazon.
Collapsible Aluminum Trekking Poles, 2-Pack
If you're outfitting a partner or a section-hike crew, this 2-pack is the cheapest credible option in 2026 — anti-shock springs, EVA grips, and tungsten carbide tips at a price point that makes losing one in a river crossing non-catastrophic. They're heavier than the Nordic poles by about 1.5 ounces per pole, but they're an honest budget pick that pairs fine with the Arc Haul's lighter load profile. View the 2-pack on Amazon.
Which pack should you actually buy?
Buy the Mariposa 60 if you're hiking the PCT or CDT with a bear can, your base weight is realistically 12–15 pounds, you want one pack that handles desert water carries and Sierra resupply, and you'd rather spend $305 than $379. Buy the Arc Haul Ultra if your base weight is under 11 pounds, you hike in hot humid environments where back ventilation matters more than any other feature, and you want a pack that will look new when you finish. For a long-term wear report on the latter, see our Zpacks Arc Haul long-term review.
Between the gossamer gear mariposa 60 vs zpacks arc haul, there is no wrong answer — only a wrong match between pack and hiker. Both companies have nailed the ultralight 60-liter category and both packs will quietly disappear on your back when the fit is right.
Frequently Asked Questions
Is the Mariposa 60 or Arc Haul better for the PCT?
For the PCT specifically, most thru hikers reach for the Mariposa 60 because of the oversized side pocket that accommodates a Bear Vault BV450 or BV500 externally through the Sierra, plus the heavier hipbelt that handles the long water carries in southern California. The Arc Haul becomes more comfortable through Oregon and Washington once loads drop below 25 pounds.
Can the Zpacks Arc Haul carry a bear can?
Yes, but internally. The Arc Haul's symmetric mesh side pockets are not sized for a BV500 horizontally, so the can rides vertical inside the main compartment and consumes about 11 liters of usable volume. Most Arc Haul hikers compensate by carrying less food between resupplies, which works on the PCT but is harder on the CDT.
How long does Ultra 200X fabric last on a thru hike?
Real-world reports through 2025 show Ultra 200X bodies finishing a full triple crown (about 7,900 miles) with no through-abrasion, though high-wear points like the lid Y-strap contact and the bottom panel develop visible scuffs. The carbon arc stays are typically the first failure point, not the fabric.
Is the Gossamer Gear Mariposa 60 waterproof?
No. The Robic 100D body has a DWR finish that sheds light rain for an hour or two but absorbs water in sustained downpours. A trash compactor bag pack liner is the standard solution and adds about 2 ounces. The Mariposa's mesh side pockets drain quickly when wet, which is a plus during stream crossings.
Which pack has better hipbelt pockets?
The Mariposa 60's hipbelt pockets are noticeably larger and will hold a phone in a case, a small snack, and a lip balm simultaneously. The Arc Haul's pockets are zippered and well-built but tighter — a modern phone fills one pocket completely. For hikers who keep a camera or InReach on the belt, the Mariposa wins.
Can I use trekking poles to set up the tents these packs are designed for?
Yes — both Gossamer Gear and Zpacks design their packs to pair with trekking-pole shelters like The One, the Plexamid, or the DCF Duplex. Aluminum poles like the Nordic 7075 are stiffer under pitch tension than thin carbon poles, which is one reason many thru hikers carry aluminum even when carbon is technically lighter.
Are these packs worth the price compared to a budget 60-liter pack?
For a single weekend, no — a $120 pack will finish a 30-mile loop fine. For a thru hike, the weight savings (1.5–2 pounds versus a traditional internal frame pack) compound over millions of steps and meaningfully reduce knee and Achilles strain. Both the Mariposa 60 and the Arc Haul are priced where they are because they represent more than ten years of iteration on cottage-industry ultralight design, and both retain strong resale value if you decide they're not for you.
Key Takeaways
- Choosing the right gossamer gear mariposa 60 vs zpacks arc haul means matching capacity and output ports to your actual devices
- Always check actual watt-hours (Wh), not just watts — runtime depends on Wh, not peak output
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- Compare price-per-Wh across models to find the best value for your budget