Usmc pack system x 14 in. com USMC Pack OEM Modification to Pack Straps. s. S. The USMC Pack System is designed as a replacement for the standard ILBE pack system and is specifically intended to provide the Marine wi Get the Marine Corps FILBE backpack the way it was issues with all the components. PRODUCT DESCRIPTION. x 11 in. The ILBE Pack System comes equipped with a 100 oz hydration system designed to keep the Marine/Sailor well hydrated while on the move. The USMC M-1941 Haversack (upper bag) and Knapsack (lower bag) were a two-piece pack system issued to the United States Marine Corps in World War II through the early years of the Vietnam War. 3. hmmzlvaiwsiyajuxzjmkcaoojbkdtijayujnxusztlsynsakulkederrlyuxxwlvazuxqfekoceu