Ultralight Backpacks · 2026 Comparison
Osprey Exos 58 vs Gossamer Gear Mariposa 60
Side-by-side published specs and honest spec-only analysis. No fabricated verdicts.
Quick Answer
The choice comes down to priorities. The Gossamer Gear Mariposa 60 is 280 g lighter on the spec sheet — pick it if minimum carry weight leads. The Osprey Exos 58 costs $55 less at MSRP — pick it if budget leads. Neither has a full review yet — treat the recommendation as a shortlist starter, not a verdict.
The Specs Side by Side
PackOsprey
Osprey Exos 58
- Price (MSRP)
- $260
- Weight
- 1.25 kg (1250 g)
- Ultralight
- Yes
- Our rating
- specs only — no full review yet
Manufacturer description
58 L, ~1.25 kg, ventilated AirSpeed frame, removable floating lid.
PackGossamer Gear
Gossamer Gear Mariposa 60
- Price (MSRP)
- $315
- Weight
- 0.97 kg (970 g)
- Ultralight
- Yes
- Our rating
- specs only — no full review yet
Manufacturer description
60 L, ~0.97 kg, single aluminum stay, large mesh side pockets.
What the Numbers Say
- ▸Weight: Gossamer Gear Mariposa 60 is the lighter of the two by 280 g (0.97 kg vs 1.25 kg). For thru-hiking and any pursuit where carry weight compounds across days, that delta matters.
- ▸Price: Osprey Exos 58 is cheaper at MSRP by $55 ($260 vs $315). Real-world street prices vary, but the starting MSRP gap is consistent.
- ▸Ultralight classification: both products are classified ultralight in their category — built for weight-conscious backpackers from the start.
- ▸Review coverage: neither has a full review yet. Specifications are taken from current manufacturer product pages.
Detailed Breakdown
Carry weight and packed size
On the published spec sheet, the Gossamer Gear Mariposa 60 comes in at 970 grams against the 1250 grams of the Osprey Exos 58. That 280-gram gap may sound trivial in isolation but compounds across multi-day trips — at 25 km a day for a week, you're carrying that delta for about 175 km of trail. The Gossamer Gear Mariposa 60's ultralight classification reflects the deliberate design choices that produce the saving: thinner fabrics, simpler architectures, or fewer secondary features.
Price and total cost of ownership
MSRP gap: $55 (Osprey Exos 58 cheaper). For most buyers that's the only price number that matters short-term. Long-term cost depends on durability and warranty handling: a product that lasts seven seasons at $315 costs less per use than a product that lasts three at $260. Without long-term field data on both we won't claim a winner on durability, but it's the lens to apply if you re-sell or replace gear infrequently. Look for current sales on either before assuming MSRP is what you'll pay.
Materials and durability
Material composition for both products comes from the manufacturer product pages and is not always reported in directly comparable units. The Osprey Exos 58 carries the manufacturer's published spec only; the Gossamer Gear Mariposa 60 carries the manufacturer's published spec only. Without a full review of either, treat material and durability claims as starting points rather than verdicts. Reader reviews on REI or Amazon (filtered to verified purchases) often reveal failure modes that brand copy doesn't.
Features and ergonomics
Manufacturer feature descriptions: the Osprey Exos 58 — 58 L, ~1.25 kg, ventilated AirSpeed frame, removable floating lid.. The Gossamer Gear Mariposa 60 — 60 L, ~0.97 kg, single aluminum stay, large mesh side pockets. Pay particular attention to fit, adjustability, and hand-feel — three dimensions that don't show on a spec sheet and that disproportionately determine whether you'll actually reach for the gear after the first trip.
Use-case fit
The ultralight backpacks category covers a wide range of trip styles. For weight-counted thru-hikes, lean toward whichever is lighter on this page — every gram in your pack rides with you for thousands of kilometers. For weekend trips and base-camp days, weight matters less and durability, comfort, and feature count matter more — the heavier of the two on this page often makes more sense in those scenarios. For three-season generalist use, our recommendation: prioritize the product you can handle in a store or borrow from a friend, because neither has a full review on this site yet.
Brand support and availability
Osprey and Gossamer Gear both produce ultralight backpacks for the North American and EU markets. Availability varies: smaller cottage brands may require direct-from-manufacturer ordering with 2-6 week lead times, while bigger brands stock through REI, Backcountry, and large EU outdoor chains with same-week shipping. Before buying either, check the manufacturer's warranty terms (often 1, 2, or 10 years depending on brand culture) and the brand's reputation for honoring claims on minor failures versus catastrophic ones. Neither product has a full review on this site yet, so check owner reports for warranty experiences before buying.
Frequently Asked Questions
Which is lighter, the Osprey Exos 58 or the Gossamer Gear Mariposa 60?
On published manufacturer specs, the Gossamer Gear Mariposa 60 is the lighter of the two by 280 grams (0.97 kg vs 1.25 kg). For ultralight backpackers counting grams in the ultralight backpacks category, that's a meaningful difference.
Which costs less, the Osprey Exos 58 or the Gossamer Gear Mariposa 60?
At MSRP, the Osprey Exos 58 costs $55 less than the Gossamer Gear Mariposa 60 ($260 vs $315). Real-world prices fluctuate with sales and seasonal promotions, but the spec-sheet starting price is clear.
Does this site have full reviews of both products?
Not yet. Neither the Osprey Exos 58 nor the Gossamer Gear Mariposa 60 has a full review on this site yet. This comparison is built from published manufacturer specifications only, clearly labeled. Treat it as a shortlist starting point rather than a verdict.
Is the Osprey Exos 58 ultralight by industry standards?
Yes. The Osprey Exos 58 is classified ultralight in our database (1.25 kg, sub-threshold for its pack category). Ultralight ultralight backpacks typically means built for thru-hikers and gram counters rather than three-season car-camping use.
Is the Gossamer Gear Mariposa 60 ultralight by industry standards?
Yes. The Gossamer Gear Mariposa 60 is classified ultralight in our database (0.97 kg, sub-threshold for its pack category). Built for thru-hikers and weight-conscious backpackers.
Is the price difference worth it?
The Gossamer Gear Mariposa 60 costs $55 more than the Osprey Exos 58 but is 280 g lighter. That's roughly $0.20 per gram saved. Whether that's worth it depends on how often you carry it: a thru-hiker saving grams every day for months will rationalize the premium more easily than a weekend backpacker.
Where can I read the full review?
Neither product has a full review yet. The current page lists manufacturer-published specifications for both. We'll add full research-based reviews as published testing and owner feedback accumulate.
Bottom Line
Winner on weight: the Gossamer Gear Mariposa 60 by 280 g (0.97 kg vs 1.25 kg). If your trip style punishes grams, that's the pick.
Winner on price: the Osprey Exos 58 at $260 versus $315 for the Gossamer Gear Mariposa 60 — a $55 gap that may close or widen with current sales.
Our overall lean: we don't have a strong overall lean because neither has a full review yet. Use this page as a shortlist tool, then read independent reviews on the brand sites, REI, and YouTube before deciding.