The large field pack is designed to carry up to 70 pounds of existence loads which include clothing, personal items and rations.
The medium field pack is designed to carry up to 50 pounds of existence loads which include clothing, personal items and rations.
The large field pack with internal frame is used to transport the individual's existence load in all environmental conditions. Even load distribution is achieved through the adjustment features. The patrol pack is used for short missions, and can be attached atop the field pack.
The M-1961 combat field pack is used to carry individual rations and equipment that are essential during field operations.
The M-1967 combat field pack is larger than the M-1961 field pack and made of nylon.