Sea to Summit Alto TR2 Bikepack
We don't stock this shelter and haven't slept in it. What we hold is the measurements its maker published, and the one question those answer that a spec sheet never does.
Will it go on your bars?
The folded pole set is 300mm, the 5th shortest of the 29 shelters we hold a pole length for. At 1648g it is 35th lightest of 37.
Comfortably inside the usable span on drop bars, with room for cables and a harness.
Comfortably inside the usable span on flat bars, with room for cables and a harness.
A pole set clears drop bars under 350mm and is marginal to 380mm; on flat bars those figures are 450mm and 500mm. Those are usable span between the hoods, not measured bar width. Check the clear run on your own bike before committing — hoods, cables and light mounts all eat into it.
What will it pack into?
Sea to Summit gives the packed size as 13 x 18 x 30 cm, which read as a box is 7 litres. Of the 55 bags we hold a published capacity for, 24 have room for it on their own and 31 do not.
- Tailfin CargoPack Alloy — 18L, 11L spare
- Apidura Expedition Saddle Pack 17L — 17L, 10L spare
- Revelate Designs Spinelock 16 Seat Bag — 16L, 9L spare
- Revelate Designs Sweetroll Handlebar Bag — 15L, 8L spare
- Wildcat Gear Tiger Handlebar Bag — 15L, 8L spare
Volume against volume, which is the honest limit of this: it says the bag is big enough, not that a tent-shaped object goes through its opening. "Spare" is what is left for everything else, and a shelter that only just fits leaves nowhere for a sleeping bag.
What the maker publishes
| Folded pole length | 300mm |
|---|---|
| Packed size | 13 x 18 x 30 cm |
| Minimum weight | Not published |
| Packed weight | 1648g |
| Sleeps | 2 |
| Inner floor | Not published |
Blank fields stay blank. Where a maker doesn't publish a figure we say so rather than estimating one.
How this figure is held at all
29 of the 43 shelters we track publish a folded pole length. It is the number that decides handlebar carry and the one most makers leave out, which is why the tent finder filters on it and reports how many shelters it had to exclude for missing it. The shortest set we hold is the Nordisk Lofoten 1 ULW at 220mm.