Simpsons Lisa's Pony Kwik-E-Mart Squishee machine Homer Slurpee

7-Eleven has a sweet deal today. Super-size a medium Slurpee for free! The convenience store is celebrating Bring Your Own Cup Day on April 11. Unfortunately, your stomach doesn’t qualify as a container. All cups must be able to fit though an 11-inch hole on display. That leaves a lot of room for unusual cups such as a Thermos, beach bucket, iced tea pitcher or milk jug, which can hold 128 ounces as opposed to the 22 ounces of a standard medium Slurpee priced at $1.49.

Share your photos with the hashtag #BYOCupDay to see them on the 7-Eleven website.