You can always try the plastic jars that are used for mayonnaise. Personally, I use a 1 liter Schweppes bottle (tonic or club soda) for carrying and the bottom half of a 2 liter pop bottle (0.7 oz) as a Steripen stirring container. The cut-off pop bottle provides a lot of stirring room and is also an auxiliary camp water container.
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May I walk in beauty.