According to USA Today, this Saturday, participating 7-Eleven stores, 7,700 of them across the country will fill nearly any receptacle that you bring in for the price of the normal medium cup or about $1.49.
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There is a catch as usual. It has to fit through a 10-inch diameter hole, and can't be something like a shoe which is too unsanitary or a baseball cap that is too porous according to USA Today.
Slurpee's official Twitter site has been promoting the day, even giving suggestions on what you can use Saturday.
Not sure if your cup of choice will be accepted? Log on to Snapchat today to find out.