Name: Nemo Dagger Osmo 2P
Brand: Nemo

For a sub-4-pound tent, the Nemo Dagger Osmo 2P offers outstanding livability. Its symmetrical 88-by-50-inch floor is spacious for two and avoids the common foot-end taper found on many backpacking tents. With 30.6 square feet of space, it beats out similarly built models like the Big Agnes Copper Spur UL2 (29 sq. ft., tapered) and Nemo’s own Hornet Osmo 2P (27.5 sq. ft.). We comfortably fit two 25-inch-wide pads side by side (a rarity for a backpacking tent) with room left at the foot for gear, and appreciated the vertical sidewalls, prebent poles, and dual-hub pole system, which kept the space feeling upright and usable—especially at the head and shoulders.

The peak height of 43 inches is among the best in the lightweight category, just a half inch behind the Sea to Summit Telos. It’s a full 3 inches taller than the Hornet and noticeably roomier than the Copper Spur (40 in.). At 6’3”, I was able to sit upright without issue. Compared to the previous Dagger, the new Osmo fabric helps the tent pitch crisper and tighter, lending a slightly more open, less sag-prone ceiling. In short, it’s one of the most livable lightweight backpacking tents out there.

Camper inside the Nemo Dagger Osmo 2P backpacking tent

At 3 pounds 15 ounces all in, the Nemo Dagger Osmo 2P isn’t winning any awards for ultralight cred, especially stacked against competitors like the Big Agnes Copper Spur UL2 (3 lb.), Nemo Dragonfly Osmo (3 lb. 2 oz.), or Hornet Osmo (2 lb. 8 oz.). It is a touch lighter than the previous Dagger (4 lb. 2 oz.), but still falls on the heavier side for the premium category. Packed size is similarly average at 20 x 6.5 x 3.5 inches—not oversized, but bulkier than more minimalist designs like the Copper Spur (19.5 x 4 in.).

That said, most of the lighter options come with tradeoffs in headroom, floor space, and overall sturdiness. The Dagger offers more interior volume, a taller peak height, and a freestanding setup—all of which contribute to its extra weight. For $500, we’d prefer it shaved a few ounces, but for backpackers who prioritize comfort and usability over gram-counting, the weight and size are totally manageable and well justified.

Nemo Dagger Osmo 2P backpacking tent in stuff sack next to water bottle for scale

With its proprietary Osmo fabric and confidence-inspiring pole structure, the Nemo Dagger Osmo 2P offers solid protection for a sub-4-pound tent. The waterproof Osmo fabric—Nemo’s poly/nylon blend—impressively resists sagging when wet, and in testing during steady rain and wind on Maui’s exposed coast, the fly stayed taut and the interior bone-dry. Full-coverage rainfly protection extends low enough to block wind-driven rain while still allowing for airflow underneath, and both vestibules remained leak-free even in sustained showers.

Wind performance is equally solid. The freestanding, hubbed pole structure gives the Dagger a stable and resilient frame, easily outperforming semi-freestanding competitors like the Tiger Wall or Mayfly, which we’ve seen collapse in gusty conditions. Staked out with guylines, the Dagger feels secure and planted even in strong winds. And thanks to its mostly mesh canopy and fly-end strut vents, we had no issues with condensation buildup—even in muggy, tropical humidity. It’s a strong showing all around for such a livable backpacking tent.

Nemo Dagger Osmo 2P backpacking tent set up with rainfly

The Nemo Dagger Osmo 2P strikes a strong balance between weight savings and durability. The proprietary Osmo poly-nylon ripstop fabric feels noticeably more robust than typical ultralight materials, with a slightly textured floor that inspires confidence when setting up on abrasive ground. While Nemo doesn’t list denier specs, the fabric seems comparable to 30D options and is a clear step up from thinner competitors like the Big Agnes Copper Spur or MSR Hubba Hubba LT, both of which use lighter, more delicate 20D materials.

The Dagger’s mesh canopy is lightweight but doesn’t feel overly fragile, and overall construction reflects Nemo’s reputation for quality. It’s not bombproof—you’ll still want to avoid the rockiest of sites—but you don’t have to baby it like some ultralight backpacking tents. More rugged options like Dyneema models from Hyperlite or Zpacks offer greater long-term durability but at a much higher price point. For its weight class, the Dagger hits a sweet spot.

The Nemo Dagger Osmo 2P is among the easiest tents in its class to set up. As a fully freestanding design, it eliminates much of the hassle of choosing a perfect site—unlike semi-freestanding or trekking pole shelters, it doesn't rely on perfectly tensioned stakes or specific configurations to hold its shape. One upgrade in this latest version is the new Axial corner anchors, which simplify setup with one-handed operation and built-in tensioning. Compared to the previous model’s ball-and-socket system, it’s a clear improvement, particularly when pitching solo or in windy weather.

Thanks to clear instructions, improved color-coding, and a slightly crisper Osmo canopy fabric that holds its shape well, the Dagger’s setup process is quick and intuitive. Once familiar with the corner system, I had the tent pitched in just about four minutes—right on par with the previous version, but with less fiddling and more user-friendly design overall.

Camper holding Nemo Dagger Osmo 2P backpacking tent poles

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Longevity

Choosing durable outdoor gear is perhaps the most effective way to reduce environmental impact—the longer it lasts, the less it needs to be produced. Our proprietary longevity rating evaluates overall build quality based on factors such as materials, fabric denier, component durability (including zippers and toggles), real-world performance as reported by our field testers, and our experiences with the brand.

Read Sustainability Report

Interior Storage

The Dagger Osmo features four interior pockets: two low on the sidewalls and two Nightlight Pockets near the ceiling that double as diffusers for your headlamp. This layout remains unchanged from the previous version and is functional for small items like a phone, headlamp, or first aid kit. However, we’d like to see Nemo incorporate at least one large pocket to stash bulkier items or layers—something that brands like Big Agnes and MSR do well with their dump-style end-wall pockets. As it stands, interior organization is serviceable, but not standout.

Nemo Dagger Osmo 2P backpacking tent nightlight pocket

Vestibules

Vestibule storage is a clear high point of the Dagger Osmo 2P. Each vestibule provides 12.1 square feet of space—a slight but useful bump over the previous version. That’s significantly roomier than alternatives like the Copper Spur (9 sq. ft.), Hornet (7.1 sq. ft.), and Telos (9.75 sq. ft.). Nemo also includes their “Landing Zone,” a waterproof tub that sits inside each vestibule and elevates gear off wet or muddy ground—perfect for wet weather trips. This added functionality makes the Dagger Osmo one of the best options in its class for storing and protecting gear outside the sleeping area.

Nemo Dagger Osmo 2P backpacking tent waterproof storage tub in vestibule

Big Agnes Copper Spur UL2 ($550): Better Space-to-Weight Ratio
Like the Dagger, the Copper Spur was redesigned this year. It’s now lighter (3 lb.) yet still has plenty of space, with an 88-inch-long body—same as the Dagger—and 52 inches across at the head. This is basically an ultralight backpacking tent without the typical ultralight squeeze, although the Copper Spur tapers down to 42 inches across at the foot end (something to keep in mind if you use 25-inch-wide pads). Some campers might prefer the Dagger’s symmetrical design, although we’ve never had a problem with space in the Copper Spur despite its lower peak height (40 in.) and much smaller vestibules (9 sq. ft. each). The Copper Spur will also save you almost a full pound of base weight. However, the Dagger is $50 cheaper, and it might be the better tent if you want the bump in extra space for a dog or a small child. For more, read our Big Agnes Copper Spur UL2 review.

Nemo Mayfly Osmo 2P ($400): Lighter and Cheaper, But With Tradeoff
The Nemo Mayfly and Dagger Osmo 2P share DNA but diverge in execution. The Mayfly is lighter by half a pound (3 lb. 8 oz. vs. 3 lb. 15 oz.), costs $100 less, and uses the same waterproof and low-stretch Osmo fabric. But the tradeoffs are clear: it’s semi-freestanding (less stable in wind), significantly smaller inside (just 27.9 sq. ft. vs. the Dagger’s roomy 30.6), and its low peak height and tapered floor feel cramped by comparison. If budget and weight matter most, the Mayfly delivers solid value—but the Dagger is far more livable and weather-ready. For more, read our review of the Nemo Mayfly Osmo.

Nemo Hornet Osmo 2P ($430): Ultralight but Less Livable
The Hornet Osmo is a true ultralight shelter at just 2 lb. 8 oz., making it a pound and a half lighter than the Dagger Osmo 2P. Both use the same high-quality Osmo fabric, but the similarities mostly end there. The Hornet is semi-freestanding, noticeably tighter inside (27.5 sq. ft. vs. 30.6), and tapers aggressively at the foot, which limits room for two adults. It also flattens more easily in wind. If shaving ounces is your top priority and you camp in mild conditions, the Hornet is a smart pick. Otherwise, the Dagger offers far better livability and performance. For a deeper dive, see our Nemo Hornet Osmo review.

Nemo Dagger Osmo 2P ($550)

Nemo Dagger Osmo 2P backpacking tent vestibule

4.7/5

The Nemo Dagger is made for hikers who want to max out backcountry comfort. The tent doesn’t levy too harsh of a weight tax, considering the room it provides, and it’s a well-constructed model. Its high price tag would fit better on a lighter design, though.

Shop Dagger 2P

Type

Freestanding

Packaged weight

3 lb. 15 oz.

Floor dimensions

88 x 50 in.

Capacity

2P (3P)

Interior Space

5/5

Weight & Packed Size

3/5

Weather Protection

4/5

Durability

3.5/5

Ease of Use

5/5

Sustainability

5/5

Big Agnes Copper Spur UL2 ($550)

Big Agnes Copper Spur UL2 backpacking tent at campsite

4.8/5

Our favorite do-it-all backpacking tent, the Copper Spur, gets a welcome update for 2025. It’s now even lighter, with updated fabrics and the same accommodating dimensions. Yes, its price is hard to swallow, but this tent won’t let you down.

Shop Copper Spur UL2

Type

Freestanding

Packaged weight

3 lb.

Floor dimensions

88 x 52/42 in.

Capacity

2P (1, 2XL, 3, 3XL, 4, 5P)

Interior Space

4/5

Weight & Packed Size

4/5

Weather Protection

4/5

Durability

2.5/5

Ease of Use

4/5

Sustainability

3/5

Nemo Mayfly Osmo 2 ($450)

Sitting inside Nemo Mayfly Osmo 2P backpacking tent

4/5

While the Mayfly ranks a tad below Nemo and other brands’ premium ultralight offerings, this tent still has much to offer. It’s durable, competitively priced, exceptionally waterproof, and light enough for most backpacking trips. However, it performs poorly in wind and doesn’t offer a good space-to-weight ratio.

Shop Mayfly Osmo 2

Type

Semi-freestanding

Packaged weight

3 lb. 8 oz.

Floor dimensions

85 x 52/43 in.

Capacity

2P (3P)

Interior Space

3/5

Weight & Packed Size

3/5

Weather Protection

2.5/5

Durability

4/5

Ease of Use

3.5/5

Sustainability

4.6/5

Is the Dagger Osmo 2P for You?

If you want a roomy, fully featured backpacking tent that doesn’t require babying and can handle real weather, the Dagger Osmo 2P should be on your shortlist. It’s heavier than many ultralight models, but you get standout interior space, excellent protection in wind and rain, and thoughtful extras like massive vestibules and Nemo’s Landing Zone gear tubs. If you’re an ounce-counter or primarily camp in fair weather, there are lighter and cheaper options. But for backpackers who value livability and storm-worthiness in a still-manageable weight, the Dagger strikes a very compelling balance.