I had much rather someone drink on a course than smoke a cig.
As for a hydroflask, they are way too heavy....plus beer should only ever be stored in glass.
Actually most of the brewers I've spoken to say cans are better. Evidently given enough time light filtering through the glass can age the beer in odd ways. The opaque-ness of aluminum prevents that.
Don't shoot the messenger, just what I've been told.