I claim the ornamental design for a collapsible laundry basket, as shown and described.
FIG. 1 is a front and top perspective view of a first collapsible laundry basket embodiment of the invention in a collapsed position.
FIG. 2 is a front elevation view of the first embodiment of the invention in a collapsed position.
FIG. 3 is a back elevation view of the first embodiment of the invention in a collapsed position.
FIG. 4 is a right side elevation view of the first embodiment of the invention in a collapsed position, the left side elevation view being a mirror image of the right side elevation view.
FIG. 5 is a top plan view of the first embodiment of the invention in a collapsed position; and,
FIG. 6 is a bottom plan view of the first embodiment of the invention in a collapsed position.
The broken lines in the drawings depict environment subject matter only and form no part of the claimed design.