Letter of authentication and provenance from Mary Gallagher are included with the bag, as well as a picture shown of her with the bag in 1963. The bag is 34.5" and in excellent condition.
From Heritage Auction Galleries:
The golf bag offered here, unlike another sold with a set of clubs at auction for a high six-figure price several years ago, shows years of loving use. The tan canvas is soiled, the leather trim appropriately worn. The documentation for the bag is impeccable: It was given to Mary Barelli Gallagher by Mrs. Jacqueline Kennedy in the White House in June of 1963, when she was doing some spirited "spring cleaning." The bag had been in storage for several years, so was doubtless used by Kennedy during his senatorial years. Gallagher served as JFK's personal secretary from 1953 to 1956, and as Mrs. Kennedy's from 1956-1964. In 1969, she published My Life with Jacqueline Kennedy (New York: D. McKay Co.)