This caught us by surprise. The venerable Solo cup, a wily veteran of countless BBQ's, graduation parties, receptions, camping trips, and many summer beverages has a trick up its sleeve: built in measurement marks.
It sounds almost too true, too clever, to be believable right? I thought so as well. A quick survey of the studios produced the same reaction. No one had ever heard of it or knew it.
This bit of knowledge was discovered on a link from the ever helpful Reddit TIL community. Never one to be caught by the old axiom of "It's true; I read it on the Internet", a test was proposed.
Using a measured pint glass, helpfully marked with measurements from 1oz. - 8oz., water was carefully measured out then poured into the Solo cup. Happily, this is an internet fact that can be confirmed. The lines do correspond to some typical beverage servings: 12oz., 5oz., and 1oz.
Never again will you be stuck at another backyard party or in the woods camping without a way to handily measure out a liquid. A nice uncommon and useful piece of knowledge that will serve you well this summer. Just as handy? Knowing how to build a campfire.