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Ah ok, with a little flippy top thing. I was hoping for something I could use with any bottle, but I may well have to try one of those. Bit bored of mouthfuls of grit. Although I had my bottle on my down tube, shoved right up underneath my frame bag this morning and it kept the worst off (usually have it on the seat tube if I have a frame bag on the bike)
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I had a bottle with a flippy covery thing, cost way too much. It lasted about a month before rolling off the station platform and under a train on a journey home one time.
Maybe consider making a little fairing? Plastic with a heat gun, mounts to bottle cage bolt, acts as a mini mudguard aero thingy?
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I have one of these. Not too speny either.
camelbak dirt bottles are actually quite ok