TentCheck

NEMO Dragonfly OSMO 3P

Floor 88 × 70/65 in, 42 in peak, vestibules 8.6 sq ft + 8.6 sq ft. Drawn to scale from the maker's listing; the grid is 6 in.

Which pads fit

3 regular padsFits

An inch or more to every wall. Sit-up room +2.9 in.

3 wide padsDoesn't fit

They don't fit side by side: 1.9 in past the wall.

3 mummy padsFits

An inch or more to every wall. Sit-up room +2.9 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 overheadFloorShare
Anywhere41.3 sq ft100%
12 in or more39.4 sq ft96%
24 in or more32 sq ft78%
36 in or more16.2 sq ft39%

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)88 × 70/65 in, 41.3 sq ft
Peak42 in (3 ft 6 in)
Vestibules8.6 sq ft + 8.6 sq ft
Sleeps (maker)3
Packed weight63 oz (3 lb 15 oz)
Packed volume8.2 L
Regular pads that fit3 with an inch to every wall
Sit-up room on a pad, at the peak+6 in for 35 in sitting height
Pitched footprint88 × 120.5 in (7 ft 4 in × 10 ft), floor and vestibules
Groundsheet to cutAbout 86 × 68/63 in

On the campsite

Floor and vestibules together cover 88 × 120.5 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 86 × 68/63 in.

Notes

Floor 88 × 70/65 in, 42 in peak, two 8.6 ft² vestibules.

Sources

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.