The ornamental design for a bucketliftingstrap, as shown.
FIG. 1 is a perspective view of a bucket lifting strap showing my new design in use;
FIG. 2 is a top plan view thereof;
FIG. 3 is a front elevation thereof;
FIG. 4 is a back elevation thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a right side elevation thereof; and,
FIG. 7 is a left side elevation thereof.
The broken lines showing a bucket and portions of a human body are for the purposes of illustrating environment and form no part of the claimed design.