The ornamental design for a fluidcontainer, as shown and described.
FIG. 1 is a front, right side, and top perspective view of the fluid container, showing the new design;
FIG. 2 is a right-side view thereof;
FIG. 3 is left-side view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a rear view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is front, right-side, and bottom perspective view thereof;
FIG. 9 is a cross-sectional view taken along the line 9-9 of FIG. 6; and,
FIG. 10 is a cross-sectional view taken along the line 10-10 of FIG. 6.
The broken line showing of the fluid container is for the purpose of illustrating portions of the fluid container and forms no part of the claimed design.