The ornamental design for a flexible mount, as shown and described.
FIG. 1 is a front perspective view of a flexible mount showing my new design;
FIG. 2 is a right side elevational view of the flexible mount, the right and left sides being mirror images of one another;
FIG. 3 is a front elevational view of the flexible mount;
FIG. 4 is a rear elevational view of the flexible mount;
FIG. 5 is a top view of the flexible mount;
FIG. 6 is a bottom view of the flexible mount;
FIG. 7 is a front perspective view of the flexible mount; and,
FIG. 8 is a rear perspective view of the flexible mount.
The broken line showing of a trail camera, L-bracket, pouch, strap, tree trunk and parts of the mount is included for the purpose of illustrating environment and forms no part of the claimed design.