Old Navy has once again teamed up to recycle old flip-flops with TerraCycle. This year you can sign-up to be part of the Flip-Flop Brigade and earn Old Navy coupons for yourself and those who help you collect. The program is free to join, and shipping charges will be covered by the program too. Every time you send your old flip-flops to TerraCycle, you’ve done a green deed for Mother Nature by diverting waste from our landfills. To show our gratitude, for every shipment of 25 pairs of flip-flops received (about 18 pounds), you will receive exclusive coupons from Old Navy to distribute to the participants who helped you collect. It’s totally free to participate in a TerraCycle Brigade. There are no signup or participation fees, and the shipping is covered by the program. For more details on the program, head over here to claim your spot.