It’s here, friends! And by “it,” we mean one of the most magical days of the year. No, not Christmas or your birthday (unless it *is* your birthday, which makes this extra special), but 7-Eleven’s BYO Slurpee Cup Day.

The chain’s BYOC Day is exactly what you think it is. Hop into a 7-Eleven location with your very own travel mug, mason jar, pitcher, or keg (okay, not a keg), and you’ll be allowed to fill it up with your choice of tasty Slurpee goodness.

“Rejoice! The epic day when almost everything is a Slurpee cup is coming on Aug 18 and 19,” the brand posted on Instagram. “Bring in your craziest container and share a pic with #BYOCupDay.”

The convenience store even offered a few handy-dandy instructions to make your Slurpee score a total success.

STEP 1: Bring your custom cup into 7-Eleven on August 18 and/or August 19 between 11am and 7pm.

STEP 2: Fill your cup with as much Slurpee drink as you want for just $1.50. Score!

STEP 3: Share a pic of your cup creation with #BYOCupDay.

The promotion is taking place in the US (excluding Cook County, Illinois), Canada, Australia, Malaysia, and the Philippines, but there are a few rules. All cups must fit upright within a 10-inch hole and be food-safe clean and watertight. Additionally, customers are limited to one cup per person.

Slurpee fans are already getting into the BYO Cup action…

What will you be using for 7-Eleven’s BYO Slurpee Cup Day? Let us know @BritandCo!

(Photo via Larry Marano/Getty Images for 7-Eleven)