The advantages of using recycled plastic bottles in promotional products include: 1. Reducing plastic waste and keeping bottles out of landfills and oceans 2. Lowering the demand for new plastic production, which conserves resources and energy 3. Creating durable and versatile materials for various products like apparel, bags, and accessories 4. Demonstrating a commitment to sustainability and circular economy principles 5. Appealing to environmentally conscious consumers 6. Potentially lowering production costs compared to some other eco-friendly materials 7. Offering a unique selling point for your promotional items and brand