(cnn)bring your own beaker, goblet or vase and slurp it up 7 eleven is hosting the first bring your own cup slurpee day at united states stores from 11 am to 7 pm saturday to kick off peak slurpee season this shot at brain freeze isn't free, but customers at participating stores can fill their 'cup' of choice for $149, the average cost of a medium slurpee note: a garbage can is not a cup in store displays with a 10 inch diameter hole will rule out anything too ridiculously large for slurpee consumption, and cups must be sanitary but within those parameters, pretty much anything goes:  'from sand buckets to trophies, customers can unleash their creativity by bringing in their choice of a unique, fun slurpee cup,' said laura gordon, 7‑eleven's vice president of marketing and brand innovation, in a statement the promotion isn't to be confused with free slurpee day, traditionally celebrated each july 11
$149 7 less than 10 inches
bring your own large 'cup' for a $149 7 eleven slurpee . any sanitary container less than 10 inches in diameter is fair game 