The ornamental design for golf bag insert with fifteen club partitions, as shown and described.
FIG. 1 is a perspective drawing illustrating a golf bag insert with fifteen
club partitions, showing my new design; the opposite side view being a
mirror image thereof; and,
FIG. 2 is a top end view of thereof, the bottom end view being plain and
unornamented.
The broken line showing of environment is for illustrative purposes only
and forms no part of the claimed design.