The ornamental design for a backpack, as shown and described.
The file of this patent contains at least one drawing/photograph executed in color. Copies of this patent with color drawing(s)/photograph(s) will be provided by the Office upon request and payment of the necessary fee.
1. Backpack
1.1 is a perspective view of a backpack of the claimed design;
1.2 is a front elevational view of the backpack shown in Figure 1.1;
1.3 is a back elevational view of the backpack shown in Figure 1.1;
1.4 is a right elevational view of the backpack shown in Figure 1.1;
1.5 is a left elevational view of the backpack shown in Figure 1.1;
1.6 is a top plan view of the backpack shown in Figure 1.1;
1.7 is a bottom plan view of the backpack shown in Figure 1.1;
1.8 is a front elevational view of the backpack shown in Figure 1.1 in an alternate configuration; and
1.9 is a back elevational view of the backpack shown in Figure 1.1 in an alternate configuration.
The claimed design is shown in the figures by solid lines as well as by broken lines that represent stitching. The portion of the design shown in the color yellow in Figure 1.4 is for the purpose of illustrating a portion of the backpack and forms no part of the claimed design.