30 years ago, Pepsi launched Crystal Pepsi and they're celebrating this "milestone" by launching a Twitter contest, where they're asking people to post photos of themselves from the '90s with the hashtags: #ShowUsYour90s and #PepsiSweepstakes. It ends tomorrow. 300 winners will win some Crystal Pepsi, but there's no indication it'll be made available in stores.
Crystal Pepsi was only around for about a year in the early '90s. It didn't sell well and they stopped making it. They've brought it back several times in the past few years, but only for very brief runs.