I have an idea: Take the contents of the bag, and place it in a nice tall glass. You could even toss a couple ice cubes in it to keep it cool for a while. That would look real classy.
This is clearly inferior to the bag. And the ice is pointless as it will melt before the glass will be drunk. Also, since ice is less dense than water, you’re actually leaving even less room for liquid water in the glass that is already smaller than the bag.