Omamori (お守り) are Japanese amulets/charms/talismans sold at religious sites and dedicated to particular Shinto deities as well as Buddhist figures, and are said to provide various forms of luck or protection.
Originally made from paper or wood, modern amulets are items usually kept inside a brocade bag and may contain a prayer or religious inscription of invocation.
Omamori are then made sacred through the use of ritual and are said to contain busshin (spiritual evolutions) in a Shinto context or kesshin (manifestations) in a Buddhist context.
Omamori should never be opened in order to avoid losing their protective benefits, and should belong only to one person. Often they are tied to a backpack, purse, car mirror, etc.
Throwing an amulet in the trash is highly discouraged. Old omamori should not be placed in the trash with other commonly discarded rubbish, but rather treated with respect.