The ornamental design for an adjustable weighted multifunction fitness apparatus, as shown and described.
FIG. 1 is an isometric view of the rear of an adjustable weighted fitness backpack showing my new design;
FIG. 2 is a rear view of the adjustable weighted fitness backpack;
FIG. 3 is a front view of the adjustable weighted fitness backpack;
FIG. 4 is a side view of the adjustable weighted fitness backpack;
FIG. 5 is an opposite side view of the adjustable weighted fitness backpack;
FIG. 6 is a top view of the adjustable weighted fitness backpack;
FIG. 7 is a bottom view of the adjustable weighted fitness backpack;
FIG. 8 is an isometric view of the rear side of the adjustable weighted fitness backpack showing the shoulder straps in a stowed position;
FIG. 9 is a front isometric view of the adjustable weighted fitness backpack showing unclaimed exercise articles in the interior of the backpack; and,
FIG. 10 is an isometric view of the adjustable weighted fitness backpack showing pouches and an unclaimed water bladder in the interior of the backpack.
The broken line showing of elements of the backpack in FIGS. 1-10 depicts environmental portions of the design. No claim is made to the portions shown in broken line.