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7-Eleven will let you fill almost anything with a Slurpee this Saturday

April 11 is 7-Eleven’s “Bring Your Own Cup Day,” allowing customers the chance to bring their own container and get it filled with Slurpee for just $1.49.

But it’s not all fun and games—there are a few rules. For instance, “size matters,” meaning the cup “must fit through a 10” hole. It also needs to be “food safe” and water tight, according to 7-Eleven’s website. So a tea kettle is fair game, but a toaster is not.

The event is taking place from 11 a.m. to 7 p.m. at the estimated 7,800 7-Eleven stores in the U.S. Want to get creative with what you bring to a 7-Eleven near you? Newsday has you covered with a bunch of wacky options.

The event is intended as 7-Eleven’s Slurpee “summer kickoff,” Laura Gordon, vice president of marketing and brand innovation for the company, told USA Today. Like 7-Eleven’s well-known Free Slurpee Day, Bring Your Own Cup Day could help get more shoppers in the door.

7-Eleven was founded in 1927 and has 31,500 employees. It’s owned by parent company Seven & I Holdings and is led by CEO Joseph DePinto.

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