Simms Fish Whistle 2.0 - Elevate your angling, protect your prized tackle and make more friends on the water with Simms' most enlightening accessory. Now with extra capacity. Compression molded 600-denier polyester for durability and crush resistance Removable plastic container docks inside Internal pocket with hook and loop closure for secure storage of accessories Loop patch inside for storing flies Webbing hanging loop for safe storage