7 eleven Bring your own cup day!!! #BYOCupDay

7-Eleven stores nationwide will once again let you fill any size and shape cup with Slurpee for the $1.50 price of a medium Slurpee, but this year the event is happening for two days on both Friday and Saturday.

That's right. You can bring (almost) any cup, or drinking vessel you can think of and fill it with Slurpee on the cheap, but you do have to follow a few rules:

So leave your gigantic trash bags and leaky sneakers at home, but feel free to bring a pineapple, a flower vase or any other loony containers you have the urge to get brain freeze from.

Someone at each store will be checking to make sure customers' cups are clean, and there will be a station to check whether they meet the size restrictions.

The "Bring Your Own Cup Day" promotion runs today and tomorrow, August 19th and 20th , from 11 a.m. to 7 p.m. at about 7,700 participating 7-Eleven stores nationwide.

This year, to celebrate the 50th anniversary of the Slurpee, the company has revealed a new Airheads Xtremes Rainbow Berry Slurpee flavor in time for BYO Cup Day.

Slurpee hopes people will share photos of their outrageous Slurpees on social media with hashtag #BYOCupDay on Instagram and Twitter. The company will also be sharing all the BYO Cup Day action on its SnapChat account REALLYSLURPEE.

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