Where do Hippies hide their credit card?

Under their bar of soap! Bad-ump-ba... I never thought I'd say it, but Birkenstocks have made a comeback. Below are versions from Celine, Miu Miu and Marni. And no matter how much patchouli wafts through the air if there is in fact a true hippie-couture movement, I am never. Ever. Going to a Phish concert.