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A cheap blinky light just in case?
I was also thinking about one of those gel hand warmers with the little thing inside that you click which makes it harden and get hot. Too many instances in the past of trying to get a punctured tyre off without any feeling in my fingers and wondering if that was it now, I just live on the street, I'll never get home.
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I now carry a spare coin battery for the axs shifters. Yeah, they last years, but of the three sets of axs shifters I have, one of them has started draining the battery in a matter of weeks and it goes dead without warning. Its outside of warranty so I've just accepted that I'll change the battery frequently and always carry spares on the bike.
Even if you don't have this issue, it doesn't hurt to keep one in the bag.
Probably the wrong place for this, but I'm refreshing my long distance winter frame bag kit list.
Other than puncture repair stuff, was considering:
Anything obvious I am missing. This to have for 4-6 hour rides through the dark cold months.