[link] It's called the bottle of luck. It's a shame that I haven't searched for its origin, but it's really popular around Asian country (most for teenagers) People usually gift those tiny bottle to friends or whoever with a hope that they could be lucky. I have an university entrance exam last summer, and it's also the toughest exam throughout Vietnam so it's like standing on the fragile line of alive and death. If you study hard, make a right choice, then one step to heaven. Otherwise one step to hell. My friends gifted me lots of these bottle of luck, and the one above is from my best friend, Gueiny. It's my favourite, cause there's the sign of my horoscope on it
you just buy them straight from bookstore. It's usually have bunch of colorful beads with a small roll of paper for the friend to write down his/her wish