The ornamental design for a usbcap, as shown and described.
FIG. 1 is a front perspective view of a USB cap showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left-side view thereof;
FIG. 5 is a right-side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is a top view thereof in an exemplary use environment.
The broken line showings of the portions of the USB cap in FIGS. 1-8, and the dash dot line showing of the arm in FIG. 8, are included for the purpose of illustrating environmental structure and form no part of the claimed design.