FIG. 1 is a perspective view of a first embodiment of a backpack with an insert arrangement showing my new ornamental design;
FIG. 2 is a rear plan view thereof;
FIG. 3 is a front plan view thereof;
FIG. 4 is a right-side view thereof;
FIG. 5 is a left-side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is a perspective view of a second embodiment of a backpack with an insert arrangement showing my new ornamental design;
FIG. 9 is a rear plan view thereof;
FIG. 10 is a front plan view thereof;
FIG. 11 is a right-side view thereof;
FIG. 12 is a left-side view thereof;
FIG. 13 is a top view thereof;
FIG. 14 is a bottom view thereof;
FIG. 15 is a perspective view of a third embodiment of a backpack with an insert arrangement showing my new ornamental design;
FIG. 16 is a rear plan view thereof;
FIG. 17 is a front plan view thereof;
FIG. 18 is a right-side view thereof;
FIG. 19 is a left-side view thereof;
FIG. 20 is a top view thereof;
FIG. 21 is a bottom view thereof;
FIG. 22 is a perspective view of a fourth embodiment of a backpack with an insert arrangement showing my new ornamental design;
FIG. 23 is a rear plan view thereof;
FIG. 24 is a front plan view thereof;
FIG. 25 is a right-side view thereof;
FIG. 26 is a left-side view thereof;
FIG. 27 is a top view thereof;
FIG. 28 is a bottom view thereof;
FIG. 29 is a perspective view of a fifth embodiment of a backpack with an insert arrangement showing my new ornamental design;
FIG. 30 is a rear plan view thereof;
FIG. 31 is a front plan view thereof;
FIG. 32 is a right-side view thereof;
FIG. 33 is a left-side view thereof;
FIG. 34 is a top view thereof;
FIG. 35 is a bottom view thereof;
FIG. 36 is a perspective view of a sixth embodiment of a backpack with an insert arrangement showing my new ornamental design;
FIG. 37 is a rear plan view thereof;
FIG. 38 is a front plan view thereof;
FIG. 39 is a right-side view thereof;
FIG. 40 is a left-side view thereof;
FIG. 41 is a top view thereof;
FIG. 42 is a bottom view thereof;
FIG. 43 is a perspective view of a seventh embodiment of a backpack with an insert arrangement showing my new ornamental design;
FIG. 44 is a rear plan view thereof;
FIG. 45 is a front plan view thereof;
FIG. 46 is a right-side view thereof;
FIG. 47 is a left-side view thereof;
FIG. 48 is a top view thereof;
FIG. 49 is a bottom view thereof;
FIG. 50 is a perspective view of an eighth embodiment of a backpack with an insert arrangement showing my new ornamental design;
FIG. 51 is a rear plan view thereof;
FIG. 52 is a front plan view thereof;
FIG. 53 is a right-side view thereof;
FIG. 54 is a left-side view thereof;
FIG. 55 is a top view thereof;
FIG. 56 is a bottom view thereof;
FIG. 57 is a perspective view of a ninth embodiment of a backpack with an insert arrangement showing my new ornamental design;
FIG. 58 is a rear plan view thereof;
FIG. 59 is a front plan view thereof;
FIG. 60 is a right-side view thereof;
FIG. 61 is a left-side view thereof;
FIG. 62 is a top view thereof;
FIG. 63 is a bottom view thereof;
FIG. 64 is a perspective view of a tenth embodiment of a backpack with an insert arrangement showing my new ornamental design;
FIG. 65 is a rear plan view thereof;
FIG. 66 is a front plan view thereof;
FIG. 67 is a right-side view thereof;
FIG. 68 is a left-side view thereof;
FIG. 69 is a top view thereof;
FIG. 70 is a bottom view thereof;
FIG. 71 is a perspective view of an eleventh embodiment of a backpack with an insert arrangement showing my new ornamental design;
FIG. 72 is a rear plan view thereof;
FIG. 73 is a front plan view thereof;
FIG. 74 is a right-side view thereof;
FIG. 75 is a left-side view thereof;
FIG. 76 is a top view thereof;
FIG. 77 is a bottom view thereof;
FIG. 78 is a perspective view of a twelfth embodiment of a backpack with an insert arrangement showing my new ornamental design;
FIG. 79 is a rear plan view thereof;
FIG. 80 is a front plan view thereof;
FIG. 81 is a right-side view thereof;
FIG. 82 is a left-side view thereof;
FIG. 83 is a top view thereof; and,
FIG. 84 is a bottom view thereof.
The broken lines are included to illustrate environmental structure and form no part of the claimed design.
My design is not limited to the exact details shown in the drawings, since equivalents and colorable imitations thereof will be evident to a person of ordinary skill in the art. Within the scope of the appended claim, in which I intend to cover only the ornamental and novel elements shown in the drawings, my invention may be practiced otherwise than as specifically shown and described herein.