Free gifts and samples are a part of life in Japan. It's a necessary part of getting the following to survive in the market. Sometimes even bars will hand out samples, if they make sense in a bar setting. This little box contains a hangover prevention drink. Basically, it's turmeric and tastes awful. Some are intended for drinking before you start your night, while others are at the end. The jury is still out on whether they work, but salarymen swear by them. As you can guess, I saved mine for later.