How about polypropylene plumbing tube, of the appropriate diameter? The only problem is that it has white titanium dioxide to make it opaque, but you can write on the outside of the tube with a spirit pen, describing the contents. End caps should be available.
timnic44: Actually, I think your idea is a better one than mine. For those who may be interested, make sure that your next shopping trip includes a pharmacy, and that your enquiry is as friendly as you can make it!
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