Slurpee lovers: Bring Your Own Cup Day is back at 7-Eleven!

If you love a Slurpee, get to 7-Eleven right now!

To celebrate the surprise return of Bring Your Own Cup Day, you can fill up your own cup (see rules) for $1.50 on August 19 and August 20 from 11 a.m. to 7 p.m.

Read more: This drink could be better than water on a hot day

It’s Bring Your Own Cup Day… again!

If you need some inspiration, check out what people are sharing using the hashtag #BYOCupDay.

Bring your own cup day is no joke #BYOCupDay pic.twitter.com/MD41uug3qt

— Elizabeth Bean (@PizzzaSteve) August 19, 2016

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YALL NOT HIP !! #BYOCupDay pic.twitter.com/h6Hj9XaRcY

— Thê GrêâT (@bebedmond097) August 19, 2016

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A little Pat O’Brien’s Slurpee! #BYOCupDay pic.twitter.com/d7sMyfQPx3

— Kristin Tangel (@KristinTangel) August 19, 2016

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There are a few rules, though they may not always be enforced:

• Cup must fit upright through a 10-inch hole.
• Your cup must be food safe.
• Your cup must be watertight.
• One cup per person.

Bring Your Own Cup Day is part of Slurpee’s year-long 50^th birthday celebration.

Read more: 10 cheap and easy ways to beat the summer heat