Six Moon Designs Lunar Duo
Floor 90 × 54 in, 45 in peak, vestibules 12 sq ft + 12 sq ft. Drawn to scale from the maker's listing; the grid is 6 in.
Which pads fit
An inch or more to every wall. Sit-up room +5.9 in.
An inch or more to every wall. Sit-up room +5.8 in.
An inch or more to every wall. Sit-up room +5.9 in.
An inch or more to every wall. Sit-up room +5.8 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.
Headroom
| Roof overhead | Floor | Share |
|---|---|---|
| Anywhere | 33.8 sq ft | 100% |
| 12 in or more | 28.8 sq ft | 85% |
| 24 in or more | 20.8 sq ft | 62% |
| 36 in or more | 10.3 sq ft | 31% |
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 × 54 in, 33.8 sq ft |
|---|---|
| Peak | 45 in (3 ft 9 in) |
| Vestibules | 12 sq ft + 12 sq ft |
| Sleeps (maker) | 2 |
| Packed weight | 45 oz (2 lb 13 oz) |
| Packed volume | 7 L |
| Regular pads that fit | 2 with an inch to every wall |
| Sit-up room on a pad, at the peak | +9 in for 35 in sitting height |
| Pitched footprint | 96 × 122 in (8 ft × 10 ft 2 in), floor and vestibules |
| Groundsheet to cut | About 88 × 52 in |
On the campsite
Floor and vestibules together cover 96 × 122 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 × 52 in.
Notes
Inner 90 × 54 in, 45 in peak on two trekking poles, a door and vestibule on each long side. Six Moon lists 12 ft² of vestibule (see the open question). The weight leaves out stakes and poles.
Sources
- Six Moon Designs: Lunar Duo Backpacking Tent Checked 2026-10-22
- Six Moon Designs: Lunar Solo Backpacking 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.