The day 7-Eleven lets us name the price of our Slurpees was cause for celebration among lovers of the super sweet frozen drink (it was like summer in November!). Because we got to walk away with a large slush for just a penny if we wanted. And now the convenience chain is bringing back one of the most fun promotions it puts on: Bring Your Own Cup Day. This event means you can bring a giant-size Solo cup, a brand new beach pail, or even a fish bowl to fill up to your hearts content—and only pay $1.49 for it. Plus, this year the deal will last for not one but two days, on March 18 and March 19 from 11 a.m. to 7 p.m. The double days are in honor of the Slurpee, which is turning 50 this year.

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So if you're looking for the ultimate sugar-rush and brain-freeze combo, this is your big chance. But beware of the rules: You can only bring one vessel that is no more than 10 inches in diameter. And they must fit under the Slurpee machine display, which means they can't be more than 11 inches tall. Your container also has to be leak-proof, safe, and sanitary—which means no kiddie pools, sorry. We have a few creative ideas for you, though:

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Michael Stillwell

Of course if you don't have an oversize canister, you can always buy one of the brand's collectible 64-ounce mason jar-style cups decorated with a "Slurpee 50" logo ($4.99). But that's real dedication. 

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