The ornamental design for a beveragecontainerinsulator, as shown and described.
FIG. 1 is perspective view of the beverage container insulator showing the new design thereof.
FIG. 2 is a first-side elevational view of the beverage container insulator shown in FIG. 1.
FIG. 3 is a second-side elevational view of the beverage container insulator shown in FIG. 1.
FIG. 4 is a third-side elevational view of the beverage container insulator shown in FIG. 1.
FIG. 5 is a fourth-side elevational view of the beverage container insulator shown in FIG. 1.
FIG. 6 is a top plan view of the beverage container insulator shown in FIG. 1; and,
FIG. 7 is a bottom plan view of the beverage container insulator shown in FIG. 1.
Structure illustrated in broken lines is not part of the claimed design. The size and placement of the adhesive square visible on the top left interior portion of the design as seen in the perspective view (FIG. 1) is a mirror image of the size and placement of an identical adhesive square on the top right interior portion of the design, which is not visible in the drawing. Portion(s) of the beverage container insulator that would normally be visible, but are not shown in the drawing or described in the specification, are not part of the claimed design.