The ornamental design for a handheld bottleholder with pocket, as shown and described.
FIG. 1 is a front elevational view of a handheld bottle holder with pocket showing my new design with phantom lines depicting environmental structure and forming no part of the claimed design;
FIG. 2 is a left side elevational view thereof with phantom lines depicting environmental structure and forming no part of the claimed design;
FIG. 3 is a rear side elevational view thereof with phantom lines depicting environmental structure and forming no part of the claimed design;
FIG. 4 is a right side elevational view thereof with phantom lines depicting environmental structure and forming no part of the claimed design;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
Stippling in the figures is not intended to illustrate surface ornamentation, but is intended to show the contours of the surfaces. The line shading is provided only to illustrate contrasting surfaces; it is not indicative of color, texture, etc.