A hair band works well, girth-hitch it to the bottle cage and loop it over the drink nozzle. On my road bike, I put my tool bag in my rear jersey pocket, keeps my bike looking slicker. On my tri-bike I use this between my aero bars, works on all bikes: https://gravelcyclist.com/bicycle-tech/press-release-ortre-century-bottle-cage-storage-system-an-alternative-to-the-saddle-bag/
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