The 7-Eleven Slurpee is quite possibly the best frozen treat on the planet. Perfectly toeing the line between a liquid and frozen state, the Slurpee has been around for 50 years and only seems to be getting more popular—and new flavors like Sour Patch Kids Raspberry and Birthday Cake Fanta keep getting crazier. Slurpee's are so persistent that 7-Eleven even released a Slurpee-flavored doughnut. 

Because the drink is so unwaveringly popular, 7-Eleven has a few days out of the year it uses to remind the world that Slurpees are the ultimate frozen treat. On July 11th, or 7-11, it rewards fans with a free Slurpee just for walking through the door (and usually waiting in a line). And once a year, 7-Eleven lets you bring whatever vessel you choose to fill your own cup with Slurpee.

BYO-cup-day 2016 already passed in March, but thanks to the Slurpee's 50th birthday, 7-Eleven is doubling down on the holiday, making today and tomorrow, August 19th and 20th, Bring Your Own Cup Day​ all over again. For some inspiration before you hit the Slurpee nozzles, here are some of our favorite containers from years past.

Munchies on Deck

 

Yesterday on #byocupday #legalmarijuana #dabstagram #highatx #stonersunite #711 #slurpees

A photo posted by Pocky (@pockypopp) on Mar 21, 2016 at 9:14am PDT

 

You can Buy Empty KFC Buckets???

 

Don't play with my slurpee man! #byocup #slurpee #byoslurpeecup #byocupday #pdx

A photo posted by Richard Lawrence Wade (@pdxrelentless) on Mar 19, 2016 at 6:05pm PDT

 

One Sprite Slurpee Please

 

#BYOCUPDAY 😝

A photo posted by Mirɑndɑ 🐼 (@hiightech) on Mar 19, 2016 at 5:15pm PDT

 

It'll Clean Your Insides of All the Sugar, Right?

 

A Slurpee, Just Like Vodka, Will Never Completely Freeze

 

🏆 #BYOCUPDAY #absolutvodka

A photo posted by Hannah (@kittycatatonic) on Mar 19, 2016 at 6:27pm PDT

 

Have They Made Meat Flavored Slurpees Yet?

 

#byocup #byocupday

A photo posted by Jaime Cortez (@jcortezphotography) on Mar 19, 2016 at 6:08pm PDT

 

Smaller Than A Regular Cup, Classier Than All The Cups