The ornamental design for a capsulecontainingwashingproduct, as shown and described.
FIG. 1 is a perspective view of our new design for a capsule containing washing product;
FIG. 2 is a top view thereof;
FIG. 3 is a bottom view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a right view thereof;
FIG. 6 is a rear view thereof; and,
FIG. 7 is a left view thereof.
The broken line showing of portions of the capsule containing washing product is included for the purpose of illustrating environmental structure and forms no part of the claimed design.