7-Eleven has a ridiculous deal for Slurpee fans today — here's how to get it

7-Eleven's most bizarre annual deal is back.

On Friday, August 18, and Saturday, August 19, customers can fill up whatever container they want — from watering cans to wine glasses — with Slurpee for $1.50.

The promotion runs from 11 a.m. to 7 p.m. on both days.

There are just a few rules to follow:

• All cups must be able to fit upright through a 10-inch cutout in stores (so, no trash bags or inflatable pools).

• Needs to be safe for food and water-tight.

• Only one cup per person.

Here are some of the best photos from BYO Cup day, both from years past and from Instagrammers whom 7-Eleven gave the opportunity to kick off the event early this year.

Some people went all-natural.

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Swapping alcohol with Slurpee was also a trend.

And, some people got really creative.

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