NEMO Hornet OSMO Ultralight 1P vs Sea to Summit Alto TR1
Two shelters, measured against each other on the figures that decide whether they work on a bike.
The short answer
The Hornet OSMO Ultralight 1P takes pole length and weight; the Alto TR1 takes floor space and headroom. On a bike the pole set usually decides it before the rest do.
Assembled from the differences below rather than written over them. Every figure is a published measurement or computed from one — nobody here has used either one.
Where they differ
4 of the 6 things we can measure come out differently.
Folded pole length
130mm shorter on the Hornet OSMO Ultralight 1PThe length of the pole set broken down, which is what decides whether it goes across your bars. Almost no maker publishes it, which is why this comparison is hard to find anywhere else. The verdict beside each is for drop bars.
Minimum weight
114g lighter on the Hornet OSMO Ultralight 1PTrail weight where the maker publishes one — fly, inner and poles, without the stuff sacks or the footprint. Worth reading against the pole length rather than instead of it: a Bikepack edition is usually a few grams heavier for shorter poles.
Floor area
0.11m² more floor in the Alto TR1Inner length by inner width as published. On a bike trip the floor also has to take whatever you brought inside off the bike, so a few centimetres is not nothing.
Peak height
10cm more headroom in the Alto TR1Whether you can sit up, which decides how a rained-out afternoon goes.
Side by side
Including the rows where they are level.
| NEMO Hornet OSMO Ultralight 1P | Sea to Summit Alto TR1 | |
|---|---|---|
| Folded pole length | 320mm — fits drop bars | 450mm — too long for drop bars |
| Pole figure source | Packed bag length, used as a proxy | Packed bag length, used as a proxy |
| Minimum weight | 822g | 936g |
| Floor area | 220 × 99cm — 2.18m² | 215 × 107cm — 2.29m² |
| Peak height | 98cm | 108cm |
| Price | $370 | $380 |