Pink, purple, blue, green, gold. No, it’s not just the liquor—this crazy-cool iridescent rainbow flask is actually changing color before your very eyes! Which means it’s basically guaranteed to match any outfit. Which means it’s a totally practical purchase, right? Disclaimer : Flasks aren't meant for storing alcohol long-term. Leaving liquor in a flask for too long might lead to undesirable flavors. To keep things fresh, finish or replace the contents within a few days. Cheers and happy sipping!