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. 

Swapping alcohol with Slurpee was also a trend.

And, some people got really creative.