Flexible freight bag and method of transferring cargo using the same

A method of transferring cargo, comprising:

• lifting a flexible freight bag from a storage container using a lifting machine, the flexible freight bag being loaded with a cargo and including
• a flexible base unit including first and second panel halves that are interconnected to form a flexible base panel, the first and second panel halves having adjacent inner end portions that are fastened to each other to form a seam across the flexible base panel,
• a hanging strap assembly connected to the flexible base unit, and
• a fastener unit attached to the inner end portions of the first and second panel halves;
• transporting the flexible freight bag from the storage container to a shipping container;
• and
• detaching the fastener unit from the at least one of the inner end portions so as to separate the inner end portions and to permit falling of the cargo into the shipping container by gravity.