77a8603f_ervation__Library_of_Congress___Definition
[Term] Bag [Definition] 
A package of content that conforms to the BagIt Specification (specification available at http://www.digitalpreservation.gov/documents/bagitspec.pdf). Under the specification, a bag consists of a base directory containing a small amount of machine-readable text to help automate the content's receipt, storage and retrieval and a subdirectory that holds the content files. Sea also "Bagit Specification" and "Bagger."
NDSA Levels of Preservation Glossary - National Digital Stewardship Alliance - Digital Preservation (Library of Congress)
Definition