Hi Jeff, I checked Gordon's Equipment of the WWII Tommy but there is nothing in there that is exactly like this pack. However it has a strong similarity to the Double Ration Canister Carrier. (As to construction and overall structure.)
Thanks for the link to that reference site, I hadn't seen that one before. Must have been an early patent for that piece. Your comment made me pull the pack out again and inspect all the metal fittings and the strap ends are all marked ME Co 1924, I missed those in my initial inspection.