The ornamental design for a pannierdevice for a bicycle, as shown and described.
FIG. 1 is a front perspective view of the pannier device for a bicycle;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a right elevation view thereof;
FIG. 4 is a left elevation view thereof;
FIG. 5 is a rear elevation view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is a front perspective view of a pannier device for a bicycle according to an alternative embodiment;
FIG. 9 is a front elevation view of the pannier device for a bicycle of FIG. 8;
FIG. 10 is a right elevation view of the pannier device for a bicycle of FIG. 8;
FIG. 11 is a left elevation view of the pannier device for a bicycle of FIG. 8;
FIG. 12 is a rear elevation view of the pannier device for a bicycle of FIG. 8;
FIG. 13 is a top plan view of the pannier device for a bicycle of FIG. 8; and,
FIG. 14 is a bottom plan view of the pannier device for a bicycle of FIG. 8.
The broken lines showing a pannier device for a bicycle are included for the purpose of illustrating environment and form no part of the claimed design.