Create your circuit
Connect the battery/cable to the power bit. Then connect it to a wire, which attaches to three bargraphs.
Mount the power, light sensor and buzzer and buzzer to a mounting board.
Connecting it to the front of the backpack
Using the wire, connect the buzzer to the bargraphs, which will sit on the front of the bag. Attach the bargraph to shoes and using glue dots, stick them to the bag.