Half the bag is a phrase commonly used to describe a situation when an individual has consumed half of a bag of something. The phrase is informal and is typically associated with the use of drugs. The phrase, however, can be substituted with several other synonyms. These include "halfway through," "50% done" or "half consumed." These phrases can be used in different contexts and are more appropriate in formal settings compared to half the bag. Regardless of the phrase used, the message conveyed would remain the same. It is, therefore, important to consider the setting and the audience when selecting the appropriate phrase to use.