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I can't say I'm a cup expert, but I'm quite sure that paper cups (or straws) can be made waterproof if impregnated with wax.



You don't need to make them waterproof. How long do you plan to drink a soda or whatever else?

My kids are done in max 10mins and they look mostly untouched.

I left it for one hour in a hot cocoa though, and it was not intact anymore but still usable to a degree.


Let's say somebody gets served their beverage when they sit down, then neglect it until after they're doing eating. In a cold beverage, I'd want a straw to last at least an hour. I don't think that should be hard to accomplish either.




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