Two tents worth lining up side by side. They score within a hair of each other, so it comes down to the details below.
| Big Agnes Copper Spur UL3 | NEMO Dagger OSMO 3P | |
|---|---|---|
| GearScore | 77✓ | 76 |
| Capacity | 3 | 3 |
| Packed weight | 54.0 oz✓ | 61.0 oz |
| Floor area | 41 sq ft | 42.8 sq ft✓ |
| Space-to-weight | 12.1 /lb✓ | 11.2 /lb |
| Peak height | 43 in | 44 in✓ |
| Doors | 2 | 2 |
| Vestibules | 2 | 2 |
| Price | $650 | $650 |
| Type | Ultralight | Backpacking |
Highlighted cells mark the better spec: Copper Spur UL3 in blue, Dagger OSMO 3P in amber. A blank spec is never counted as a win. GearScore is the overall rating (0 to 100); re-weight it on the full tent comparison. Prices are current MSRP.
The Big Agnes Copper Spur UL3 and NEMO Dagger OSMO 3P take different routes to the same job. They are close enough that this really is about which handful of specs you weight most.
The Copper Spur UL3 is 7 oz lighter and better space-to-weight. The Dagger OSMO 3P is more floor area (42.8 vs 41 sq ft) and taller (44 vs 43 in peak). Their GearScores land within a couple of points (77 vs 76), so neither runs away with it.
Pick the Copper Spur UL3 if you care most about low weight and space-to-weight, which makes it the better call for counting grams on long miles. Pick the Dagger OSMO 3P if floor space and headroom matter more to you, or you are focused on comfort and room to move.
The Big Agnes Copper Spur UL3. It is 7 oz lighter than the Dagger OSMO 3P.
The NEMO Dagger OSMO 3P. It is more floor area (42.8 vs 41 sq ft) than the Copper Spur UL3.
They are nearly tied at 77 and 76 on the default algorithm, so re-weight the score to your own priorities to break the tie.
It depends on your priorities. Go with the Copper Spur UL3 for low weight, or the Dagger OSMO 3P for floor space. The spec table above shows exactly where each wins.