A system module for a storage system with at least one frame unit. The system module includes at least one coupling unit for coupling to at least one additional system module. The coupling can be disengaged by a user. The system module also includes at least one functional unit that can be positioned at least substantially inside a space spanned by the frame unit, The system module also includes at least one positioning unit, which is configured to position the functional unit relative to the frame unit in at least two at least substantially different positions.