On March 18 and 19 from 11 a.m. – 7 p.m., customers can bring any cup they like to any participating store across the country and fill it with their favorite Slurpee flavor. You can choose the way you load up on Slurpees for just $1.50 per cup.

There are only a few rules: cups must be clean, leak-proof and pass through the designated 10-inch cutout in-store. It also must be Food safe, and have to be watertight (so basically you can't come in with a cardboard box or something you hand made).

Last year some people brought in vases, kiddie pools, and train sets. So you will have to think more about your choice this year.