I have put some water in each of the pouches and they are actually waterproof. I didn't measure the amount of water but it was a similar amount to the amount of liquid in each sachet.
I have had them hanging up for 40 mins with no sign of leakage. I might leave them overnight and see what happens. Given that water is likely to leak through easier than the hydration fluid if all is good in the morning I will relax a bit.
I took a pic but don't know how to add it I'm afraid.
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