Our Pick: Big Agnes
Check price →Big Agnes Copper Spur vs NEMO Dagger OSMO: Which 2P Tent?
Same price, about $600. Same freestanding two-door layout. The Copper Spur HV UL2 is 10 oz lighter on trail weight; the Dagger OSMO 2P has 2.3 more square feet of rectangular floor, 2 more inches of headroom, and 27 percent bigger vestibules. This is a weight-versus-room decision, and we can tell you which side you are on.
By The WorldHike Gear Desk · ~10 min read · Updated 2026-08-23
Big Agnes Copper Spur HV UL2
Big Agnes
The freestanding ultralight benchmark: 2 lb 11 oz trail weight with two doors and 29 sq ft.
Check price★ Our Top Pick
Weight first: solo use, long miles, partners under 6 ft
Big Agnes Copper Spur HV UL2
The freestanding ultralight benchmark: 2 lb 11 oz trail weight with two doors and 29 sq ft.
Not sure yet? Compare all 2 picks below ↓
Short answer: buy the Big Agnes Copper Spur HV UL2 (about $600 at time of writing) if you carry the tent more than you sleep in it: it lists 2 lb 11 oz trail weight and 3 lb 2 oz packed against the Dagger's 3 lb 5 oz and 3 lb 14 oz, a 10 to 12 oz saving on every mile. Buy the NEMO Dagger OSMO 2P (also about $600) if two full-size adults, or one adult and a dog, actually sleep in it: its 90 x 50 in rectangular floor is 31.3 sq ft against the Copper Spur's 29 sq ft tapered to 42 in at the foot, the peak is 42 in against 40, and each vestibule is 11.4 sq ft against 9. Both are freestanding, both have two doors and two vestibules, both are Tier A flagships. The price does not decide it, so the use does.
A way to settle it in one question: how many nights a year do two people sleep in this tent? Under ten, and the Copper Spur's weight saving is the thing you will notice most; most of those nights one person is in it with a pack, and 29 tapered square feet is plenty. Over ten, or with a partner over 6 ft, and the Dagger's extra floor, extra headroom, and fatter vestibules are what you will notice, every night, while the 10 oz is something you stop noticing after the first hour. The fabric story matters too: NEMO's OSMO poly-nylon is listed as sagging less when wet than conventional nylon, which is the rainy-week complaint about every silnylon tent including the Copper Spur.
Disclosure: neither brand paid for this comparison. Links go to Amazon, where we earn a commission if you buy. It does not change the verdict.
The short version
- Copper Spur HV UL2: listed 2 lb 11 oz trail / 3 lb 2 oz packed, 29 sq ft (88 x 52 in tapering to 42), 40 in peak, two 9 sq ft vestibules, 15D nylon floor, 20D fly, freestanding. About $600.
- Dagger OSMO 2P: listed 3 lb 5 oz minimum / 3 lb 14 oz packed, 31.3 sq ft (90 x 50 in rectangular), 42 in peak, two 11.4 sq ft vestibules, OSMO poly-nylon ripstop, freestanding. About $600.
- Weight gap: 10 oz on trail weight, 12 oz packed, in the Copper Spur's favor.
- Space gap: 2.3 sq ft of floor, 2 in of peak height, and 4.8 sq ft of total vestibule in the Dagger's favor, plus a rectangular floor that does not taper at the feet.
- Fabric: the Copper Spur's 15D floor is the lighter and more delicate of the two; NEMO lists OSMO at 3x less stretch when wet and 4x longer-lasting water repellency than its previous fabric.
- Solo use with a pack: Copper Spur. Two adults, a dog, or a wet week: Dagger.
| Tent | Listed trail / packed | Floor | Peak | Vestibules | Fabric | Price (Aug 2026) |
|---|---|---|---|---|---|---|
| Big Agnes Copper Spur HV UL2 | 2 lb 11 oz / 3 lb 2 oz | 29 sq ft (88 x 52/42 in) | 40 in | 2 x 9 sq ft | 15D floor, 20D fly nylon | about $600 |
| NEMO Dagger OSMO 2P | 3 lb 5 oz / 3 lb 14 oz | 31.3 sq ft (90 x 50 in) | 42 in | 2 x 11.4 sq ft | OSMO poly-nylon ripstop | about $600 |
Manufacturers' listed specs, cross-checked against the live Amazon listings in August 2026. Trail or minimum weight = body, fly, poles. Prices are live Amazon figures at time of writing.
01 · Weight first: solo use, long miles, partners under 6 ft
Our Pick for WeightBig Agnes Copper Spur HV UL2
The freestanding ultralight benchmark: 2 lb 11 oz trail weight with two doors and 29 sq ft.
Field check: Listed 2 lb 11 oz trail / 3 lb 2 oz packed · 29 sq ft · 40 in peak · freestanding, 2 doors
The Copper Spur's argument is arithmetic. The Copper Spur HV UL2 lists 2 lb 11 oz trail and 3 lb 2 oz packed. The Dagger lists 3 lb 5 oz and 3 lb 14 oz. Over a 15-mile day that 10 to 12 oz is most of a pound you did not carry, and over a season it is the difference between a tent that feels like nothing and one you are aware of. The high-volume pole architecture keeps the walls steep enough that 29 sq ft sits up as usable room, and the freestanding pitch means no campsite is a bad one.
The other cost is fabric. The 15D floor is the lightest in this matchup and the most delicate; a footprint is sensible on granite and desert, and it adds 5 to 8 oz back, which narrows the weight gap to the Dagger. Silnylon, the Copper Spur's fly material, also sags when wet and wants a re-tension on rainy nights, which is the specific problem NEMO's OSMO fabric is listed to reduce. None of that changes the verdict for a weight-first buyer. It just says what the ounces cost.
- Listed weight
- 2 lb 11 oz trail / 3 lb 2 oz packed
- Floor
- 29 sq ft (88 x 52 in, tapering to 42 in)
- Peak height
- 40 in
- Vestibules
- 2 x 9 sq ft
- Fabric
- 15D nylon floor, 20D ripstop fly (listed)
- Structure
- Freestanding, two doors
- Capacity
- 2-person (listed)
- Price
- about $600
What we like
- 10 oz lighter on trail weight, 12 oz packed
- Two doors and two vestibules at that weight
- High-volume walls make 29 sq ft usable
- The category benchmark since its first version
Worth noting
- Floor tapers to 42 in at the feet
- 15D floor wants a footprint on rock
- Silnylon fly sags when wet
Who should buy it: Buy the Copper Spur if you solo in a two-person tent, if your partner is under about 6 ft, if your trips run long on mileage, or if the weight column is the one you read first. It remains the reference freestanding ultralight tent for a reason.
What we don't like: The 42 in foot taper is the compromise two tall adults feel every night. The 15D floor is thin and rewards a footprint, which eats part of the weight saving. Silnylon sags wet and needs re-tensioning. About $600 is flagship money either way.
Bottom line: The Copper Spur is the lighter tent by 10 oz on trail weight and 12 oz packed, and it gives up less for that than any freestanding two-door tent sold: 29 sq ft, a 40 in peak, and two 9 sq ft vestibules. If you carry it solo most nights, or your partner fits comfortably in a floor that tapers to 42 in at the feet, this is the tent, and the Dagger's extra room is weight you would carry for nothing.
02 · Space first: two adults, a dog, wet weeks, long trips
Our Pick for Two
NEMO Dagger OSMO 2P
A 90 x 50 in rectangular floor, 42 in peak, and 11.4 sq ft vestibules for 10 extra ounces.
Field check: Listed 3 lb 5 oz min / 3 lb 14 oz packed · 31.3 sq ft rectangular · 42 in peak · OSMO fabric
The Dagger starts from the opposite question: how much room can a tent have and still weigh under four pounds? The Dagger OSMO 2P answers with a 31.3 sq ft rectangular floor, 90 in long and 50 in wide end to end, a 42 in peak, and two 11.4 sq ft vestibules that NEMO's stash strut props open for 22 percent more covered storage, listed. Two 25-in wide pads fit side by side with no overlap. A 6 ft 4 in sleeper has room at both ends. Against the Copper Spur's 88 x 52/42 in taper, the difference is the difference between sharing a tent and enduring one.
The costs: listed 3 lb 5 oz minimum and 3 lb 14 oz packed, 10 to 12 oz more than the Copper Spur, and a larger packed volume that takes more of a pack's main compartment. For a solo hiker doing big miles, that is the wrong trade. For two people, a dog, or a base-camp week, it is the right one, and at the same price as the Copper Spur it is not a more expensive tent, just a differently allocated one.
- Listed weight
- 3 lb 5 oz minimum / 3 lb 14 oz packed
- Floor
- 31.3 sq ft (90 x 50 in, rectangular)
- Peak height
- 42 in
- Vestibules
- 2 x 11.4 sq ft
- Fabric
- OSMO poly-nylon ripstop (listed)
- Structure
- Freestanding, two doors
- Capacity
- 2-person (listed)
- Price
- about $600
What we like
- Rectangular 90 x 50 in floor, no foot taper
- 42 in peak height for sitting upright
- 11.4 sq ft vestibules, 27 percent bigger than the Copper Spur's
- OSMO fabric listed to sag less when wet
Worth noting
- 10 oz heavier trail weight, 12 oz packed
- Bulkier packed volume
- More tent than a solo hiker needs
Who should buy it: Buy the Dagger OSMO 2P if two full-size adults share the tent, if one of you is over 6 ft, if a dog sleeps on the floor, if your trips are long enough that nightly comfort compounds, or if you camp in wet climates where fabric sag is the real enemy.
What we don't like: It is 10 oz heavier on trail weight and 12 oz packed, and it packs bulkier. Solo hikers pay for room they will not use. Like every premium tent, the fabrics and poles reward care on rocky ground. About $600 is the top of this category's price ladder.
Bottom line: The Dagger OSMO is what you buy when the tent is a bedroom, not a bivy. The 90 x 50 in floor does not taper, so two adults sleep shoulder to shoulder and foot to foot; the 42 in peak lets a tall sleeper sit upright; and the 11.4 sq ft vestibules each swallow a pack and boots. OSMO fabric is listed to stretch less wet and hold its water repellency longer. The price of all that is 10 oz on trail weight, and for a pair who camps often it is the best 10 oz they will ever carry.
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Quick shop: every pick
Skip the scroll — the whole lineup, with a live price check on each.
- Big Agnes Copper Spur HV UL2Weight first: solo use, long miles, partners under 6 ftBig Agnes · about $600Check price →
- NEMO Dagger OSMO 2PSpace first: two adults, a dog, wet weeks, long tripsNEMO · about $600Check price →
How we chose
What we did: both tents are in our best-backpacking-tents guide, so this piece takes the manufacturers' listed weights, floor dimensions, peak heights, vestibule areas, and fabric specs, cross-checks the ASINs and prices against the live Amazon listings (August 23, 2026), and sets the two against each other on the single axis that separates them, ounces against square feet. The night-count threshold is our judgment from years in both designs' lineages, not a measurement.
What we did not do: we did not weigh either tent on a calibrated scale, pitch them side by side in a storm, or test fabric stretch. Where a figure is the maker's it reads as listed. Prices move with colorways and sales.
Questions, answered
Is the NEMO Dagger OSMO 2P bigger than the Big Agnes Copper Spur HV UL2?
Yes, on every listed dimension. The Dagger's floor is 31.3 sq ft (90 x 50 in, rectangular) against the Copper Spur's 29 sq ft (88 x 52 in tapering to 42 in); its peak is 42 in against 40; and each vestibule is 11.4 sq ft against 9. The Copper Spur is 10 oz lighter on trail weight.
How much lighter is the Copper Spur HV UL2 than the Dagger OSMO 2P?
On the makers' listed figures, 10 oz on trail or minimum weight (2 lb 11 oz against 3 lb 5 oz) and 12 oz packed (3 lb 2 oz against 3 lb 14 oz). Add a footprint to the Copper Spur's thin 15D floor and the gap narrows by 5 to 8 oz.
Which is better for two tall people?
The Dagger OSMO 2P. Its 90 in length and 50 in width do not taper, so two sleepers over 6 ft fit foot to foot and shoulder to shoulder, and two 25-in wide pads fit side by side. The Copper Spur's floor narrows to 42 in at the foot end.
What is NEMO OSMO fabric?
OSMO is NEMO's poly-nylon ripstop, listed at 3x less stretch when wet and 4x longer-lasting water repellency than its previous nylon. In practice it means a fly that sags less on rainy nights, which is the common complaint about silnylon tents including the Copper Spur.
Are both tents freestanding?
Yes. Both the Copper Spur HV UL2 and the Dagger OSMO 2P stand on their own pole structure and need stakes only for the fly and vestibules, so both pitch on rock, platforms, and hard ground.
Which one should a solo hiker buy?
The Copper Spur HV UL2. Solo, its 29 sq ft is more than enough for a person and a pack, and the 10 oz saving is the thing you will notice on every mile. The Dagger's extra room only pays off when a second person or a dog uses it.
Filed under Comparison
Part of Gear Comparisons
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