Backpack

FIG. 1 is a rear plan view of a first embodiment of a backpack showing my new ornamental design in a first state, comprising an insert portion that is configured to be received by a clear sleeve portion of a backpack included in the backpack;

FIG. 2 is a rear plan view of the first embodiment of the backpack in a second state, comprising the insert portion having been received by the clear sleeve portion of the backpack;

FIG. 3 is a front plan view of the first embodiment of the backpack in the first state or the second state;

FIG. 4 is a right-side elevation view thereof;

FIG. 5 is a left-side elevation view thereof;

FIG. 6 is a top elevation view thereof;

FIG. 7 is a bottom elevation view;

FIG. 8 is a perspective view of the backpack in the second state;

FIG. 9 is a rear plan view of a second embodiment of a backpack showing my new ornamental design in a first state, comprising an insert portion that is configured to be received by a clear sleeve portion of a backpack included in the backpack;

FIG. 10 is a rear plan view of the second embodiment of the backpack in a second state, comprising the insert portion having been received by the clear sleeve portion of the backpack;

FIG. 11 is a front plan view of the second embodiment of the backpack in the first state or the second state;

FIG. 12 is a right-side elevation view thereof;

FIG. 13 is a left-side elevation view thereof;

FIG. 14 is a top elevation view thereof;

FIG. 15 is a bottom elevation view; and,

FIG. 16 is a perspective view of the backpack in the second state.

The process or period in which one state transitions to another state forms no part of the claimed design.

The broken lines depict portions of a backpack and form no part of the claim.