The ornamental design for a partscontainer, as shown and described.
FIG. 1 is a perspective view of the parts container showing the novel design.
FIG. 2 is a front view thereof.
FIG. 3 is a back view thereof.
FIG. 4 is a right side view thereof.
FIG. 5 is a left side view thereof.
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
In each of the drawing figures, surface shading and transparency lines are used to clearly show the character and contour of surfaces of the 3-dimensional aspects of the design, and form no part a part of the design sought to be protected.