The ornamental design for a flyingdiscsaddlebag, as shown and described.
FIG. 1 is a side perspective view for my flying disc saddlebag.
FIG. 2 is a front elevation view of my flying disc saddlebag.
FIG. 3 is a rear elevation view of my flying disc saddlebag.
FIG. 4 is a top plan view of my flying disc saddlebag.
FIG. 5 is a bottom plan view of my flying disc saddlebag; and,
FIG. 6 is a right side elevation view of my flying disc saddlebag, wherein a left side elevation view is a mirror image thereof.
The broken lines indicating a belt and a flying disc are for purposes of illustrating possible uses for my new design and form no part of the claimed design.