Provided is a security package which generally comprises a casing for housing a product and a collar for locking the casing. The collar generally has a locked and unlocked configuration and comprises a first locking member having at least one male locking mechanism, and a second locking member having at least one female locking mechanism lockable to the at least one male locking mechanism. The casing generally has an open and closed configuration, and comprises a cavity shaped to substantially conform to the product. In the locked configuration the collar secures the casing in the closed configuration. The casing may comprise a first and second casing portion, and these may be integrally formed with the one or more of the first and second locking members. The collar may form a perimeter around the casing, may be adjustable, and may house a security device such as an RFID (radio-frequency identification) tag.