The ornamental design for a strainerpouch, as shown and described.
FIG. 1 is a front perspective view of a strainer pouch showing my new design;
FIG. 2 is a front elevation thereof;
FIG. 3 is a rear elevation thereof;
FIG. 4 is a right side elevation thereof;
FIG. 5 is a left side elevation thereof;
FIG. 6 is a top side elevation thereof;
FIG. 7 is a bottom elevation thereof;
FIG. 8 is a front elevation thereof with the strainer pouch laying flat; and,
FIG. 9 is an environmental view thereof.
The unshaded regions that are demarcated by broken lines form no part of the claimed design. The broken lines showing the colander represent unclaimed subject matter and form no part of the claimed design.