Hubba Hubba LT 3
MSR
Fits
4 lb 13 oz90 × 75 in, 42 in peak
Big Agnes Copper Spur UL3
Floor 90 × 70/62 in, 43 in peak, vestibules 9 sq ft + 9 sq ft. Drawn to scale from the maker's listing; the grid is 6 in.
- 3 regular padsFits
- 3 wide pads2.4 in past the wallDoesn't fit
- 3 mummy padsFits
Which pads fit
An inch or more to every wall. Sit-up room +3.3 in.
They don't fit side by side: 2.4 in past the wall.
An inch or more to every wall. Sit-up room +3.3 in.
Pads side by side at their listed sizes, with the average man (5 ft 9 in) lying on each. "Tight" is under an inch to a wall or the sloping roof: the fabric gives, but a wet wall wets what touches it. Open it in TentCheck to try your own pads, cots and gear, or read how fits are checked.
Where 3 wide pads fit instead
The lightest 3-person backpacking tents where they fit with an inch to every wall.
Headroom
| Roof overhead | Floor | Share |
|---|---|---|
| Anywhere | 41.3 sq ft | 100% |
| 12 in or more | 39.2 sq ft | 95% |
| 24 in or more | 31.3 sq ft | 76% |
| 36 in or more | 16.3 sq ft | 39% |
From the modeled roof, not measured. About 36 in is where an average adult sits up straight on a pad: a 35 in sitting height, plus the pad.
The numbers
| Floor (listed) | 90 × 70/62 in, 41.3 sq ft |
|---|---|
| Peak | 43 in (3 ft 7 in) |
| Vestibules | 9 sq ft + 9 sq ft |
| Sleeps (maker) | 3 |
| Packed weight | 61 oz (3 lb 13 oz) |
| Packed volume | 6.8 L |
| Regular pads that fit | 3 with an inch to every wall |
| Sit-up room on a pad, at the peak | +7 in for 35 in sitting height |
| Pitched footprint | 90 × 120.1 in (7 ft 6 in × 10 ft), floor and vestibules |
| Groundsheet to cut | About 88 × 68/60 in |
On the campsite
Floor and vestibules together cover 90 × 120.1 in. On a square tent pad, as campgrounds list them: 8 × 8 ft: doesn't fit; 10 × 10 ft: doesn't fit; 12 × 12 ft: fits. Guylines and stakes need more room around that.
For a groundsheet, cut it a little smaller than the floor, about 2 in, so rain running off the fly doesn't collect on it and run under the tent: about 88 × 68/60 in.
Notes
Floor 90 × 70/62 in, 43 in peak, a door and a 9 ft² vestibule on each side.
Sources
- Big Agnes: Copper Spur UL3 Ultralight Tent Checked 2026-10-22
Roof shapes are modeled from the floor, the peak and how the poles hold the walls, not measured. Treat a result within an inch or two as too close to call.