For those of you who solo tour and camp, how do you manage needing to be away from your bike and supplies at times? Is there no risk of theft where you go? Or do you have other strategies?
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In my experience it's very much a function of where you are and for how long.
In a campground my necessities are on me most of the time, plus I try to make friends with my neighbours, if any.
Urban campsites are riskier and some have a bad reputation for theft.
If wildcamping, the tent is normally set up at dark and I'm not going to be wandering away then.
Shopping can be trickier, but a loaded bike is more of a challenge to a thief. Left in a visible spot it should be fine. Only once or twice have I not gone shopping in a particular place after a recce. Again, valuables are in a bar bag and go with me.
I'm wary of leaving the bike for long periods of time, for example, at a museum etc. However, I've often found that a chat helps and I can often put my bike somewhere safer.
Having said all that, I tour on a 20+ year old MTB that looks like a wreck and am usually fully loaded. Someone on a more desirable bike with a lighter load faces different decisions.