Printed Flexible Packaging Manufacturer | Diamond Flexible Packaging We believe great packaging balances aesthetics, performance, cost and sustainability. Discover why leading brands rely on Brook + Whittle. Diamond Flexible Packaging specializes in custom flexible product packaging for various marketing including pet food, dry food, cosmetic, retail, industrial, and more. As a custom product packaging company, we understand the importance of delivering high-quality packaging for your products. Schedule a consultation today.