Had a quick look on his website and can't see them anymore, but you should be able to get them from a search online.
They are this kind of thing - Bottle Preforms on Etsy
From memory they were fairly robust as the plastic shell is quite thick, but not brittle, and the caps are waterproof like all plastic drink bottles.
Vibrant colours are These fantastic sports wallets, available in six. Supplied with pouch, belts and lanyard to be worn round waist, arm or neck. Comfortable and versatile.
www.ebay.co.uk
I've used on for years - also for car key when surfing
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I recently ordered a load of 18650 batteries from 18650.co.uk and they came in these storage tubes for free; they’re pretty bullet-proof and if you were to gaffa tape around the lid they’d certainly be waterproof enough to go in a case or Daren drum. They have a reasonable sized plug in the top; an o ring or similar would likely be perfect for keeping them dry!
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One on each end sealed with tape *might* be waterproof, it’d more than likely be very difficult to short the cells if they were loose ina Darren drum