A Booster Pack （ブースターパック Būsutā Pakku) is a pack of Yu-Gi-Oh! cards from one of the Booster Sets. OCG Booster Packs contain around 5 cards each, whereas TCG packs contain 9 cards. Each pack is guaranteed a Rare.
Booster Packs can be bought at most game stores and at some general/department stores.