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Depends on where you plan to use it and your tolerance to being cold at night. I looked into the series a while back but ended up getting a warmer bag from the Polish guys I can't remember the name of right now... https://cumulus.equipment/uk_en/
I have rellos that go back and forth though so can have it delivered locally -
Sea to Summit Spark I
I've got one.
I bought it when I entered the NC4000 a couple of years ago, but DNS'd it so it never got its intended usage.
I used it inside a tent when I did the North Downs way a few weeks ago. It was fine, for a couple of mild nights in late September.
There's not masses of room in it but enough for me. My plan for bikepacking with it was/is to put it inside a bivvy bag and I reckon with that plus my clothes and the option of a silk liner, I'll be fine down to zero-ish, which would be enough for anything I plan to do. But I'm quite a warm sleeper.
It seems well made, weighs nothing and can pack crazy small - but is a bit of a pain to get into its tiny storage bag (not much more than fist size), so I just stuffed it into my tailbag so that it fitted in around everything else.
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hippy
frank9755
@PBoynton
Has anyone used a Sea to Summit Spark I. This seems to be a popular one for bikepacking/ultra racing and it looks like it packs down small and is light which are my main considerations. Any thoughts on this or similar alternatives?