They're coming out with a new product for it (I believe calling it the upclip or something like that) which is a clip that you can stick under your water bottle cage to hold it. At least they told their kickstarter supporters that they're trying to make one.
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Bikes: 1996 Eddy Merckx Titanium EX, 1989/90 Colnago Super(issimo?) Piu(?), 1990 Concorde Aquila(hit by car while riding), others in build queue "when I get the time"