The Reef Dram Sandals contain an inner tube that you can fill with water (or your favourite beverage) and have a drink handy when you're out and about. Now you can have a drink anywhere you want... This is bizarre, isn't it? And by the way, they are not cheap at all: 45$ , buy at your own risk.
Implications - Flasks are a mainstay in the beverage market, but modern flasks omit pocket-sized metal containers in favor of wearable alternatives that cater to laid-back lifestyles. These stealthy flasks are far less likely to be spotted in a public place, and don't take up the space of a traditional flask.