On April 11, 7-Eleven will allow customers to participate in from 11 a.m. to 7 p.m., meaning any qualifying creative cup can be filled to the brim with Slurpee.
There are some rules for the promotion, but beyond them there is plenty of room for creativity.
Which creative cup would be the best for the promotion?
Mobile users, click above to see what cups are the best.
Comment below and tell us what cups you'd use for the promotion. If you do end up participating, use the hashtag #BYOCupDay and tweet us @Newsday to show off your cup choice.