putting a 22 oz. peg into a 21 oz. hole

Consumerist reader Michael noticed that his "22 oz." Arby's cup only holds 21 ounces of liquid. A quick look at the underside of the cup (see below) confirms that this cup can't possibly hold the amount of liquid advertised.

Is Arby’s Shortchanging Customers On Their Sodas?

There is no set-in-stone standard in the fast food industry for what constitutes a “small,” “medium,” or “large” drink, so sizes will inevitably vary from eatery to eatery. But if a company sells you a “22 ounce” soft drink, it best come in a container that can hold that amount of fluid. However, this doesn’t seem to be the case at Arby’s. [More]