7-Eleven celebrates Slurpee with "bring your own cup" days

7-Eleven is celebrating the 50th birthday of the Slurpee with its second annual Bring Your Own Cup day.

This year's promotion is from 11 a.m. to 7 p.m. on March 18 and March 19.

You can take any container and fill it up for just $1.50.

You can take in one container which must fit upright through an in-store display with a 10-inch diameter hole.

Cups cannot be more than 9-inches wide and 11-inches tall. They also must be leak-proof and sanitary (no trash cans, kiddie pools or kitchen sinks).