The ornamental design for a liquidcontainer, as shown and described.
FIG. 1 is a back perspective view thereof;
FIG. 2 is a back view thereof;
FIG. 3 is a front perspective view thereof;
FIG. 4 is a first side view thereof;
FIG. 5 is a second side view thereof;
FIG. 6 is a bottom view thereof; and,
FIG. 7 is a top view thereof.
The evenly spaced broken lines in FIGS. 1, 3, 7 depict environmental subject matter that forms no part of the claimed design. The dot-dash-dot broken lines in FIG. 6 depict the boundaries of the claim and form no part thereof. Lines and areas within those boundaries form no part of the claimed design.