We claim the ornamental design for a container neck, as shown and described.
FIG. 1 is a perspective view of a container neck showing our new design, with a container body and a container neck finish being shown in broken lines for environment only and forming no part of the claim.
FIG. 2 is a front elevational view of the container neck in FIG. 1, the rear elevational view being identical to FIG. 2.
FIG. 3 is a side elevational view from the right in FIG. 2, the opposing side elevational view being identical to FIG. 3.
FIG. 4 is a sectional view taken along the line 4-4 in FIG. 2; and,
FIG. 5 is a sectional view taken along the line 5-5 in FIG. 2.
The dashed-dot-dashed lines define the boundary lines of the claimed design. The broken lines shown in the figures are included for the purpose of illustrating environmental elements only and form no part of the claimed design.