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I think it came off once in four days, not bad for a very bent old blackburn cage attached purely by poundland electrical tape and a full 800ml bottle. eventually this will have triple mounts brazed onto the downtube, but I've got to think of a good paintjob to go over it after still.
I keep a 600ml camelbak thinwall bottle in one of my ancient revelate stem bags, that works nicely. I never really need to carry more than 1.5l water in UK conditions. I have however practised drinking like a camel at resupply points for many years
No strap necessary for the bottle? And do you keep the rest of your water in handlebar bags?