The ornamental design for a bag with tabletholder, as shown.
FIG. 1 is a front perspective view of a bag with tablet holder showing a first embodiment of my new design;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top view thereof;
FIG. 8 is a bottom view thereof;
FIG. 9 is a rear perspective view thereof, showing a cover flap in an open position to show the tablet holder; and,
FIG. 10 is a rear view thereof.
The broken lines showing the handbag strap and buckles are for the purposes of illustrating environment and forms no part of the claimed design. The closer spaced broken lines represent stitching and are part of the claimed design.