Boatswains Whistle - Stealth Ops Gear BACKPACK Made with 900D waterproof PU

Made with 900D waterproof PU fabric

Store Small Supplies In The Zippered Forearm Pocket Located On The Right Sleeve

Padded airflow mesh

Made to be lightweight with high density

Board-lasted construction for comfort and support

Boatswains Whistle - Stealth Ops Gear BACKPACK Made with 900D waterproof PUA boatswain's call, pipe or bosun's whistle is a pipe or a non diaphragm type whistle used on naval ships by a boatswain. It is pronounced, and sometimes spelled, "bosun's call". Historically the boatswain's call was used to pass commands to the crew when the voice could not be heard over the sounds of the sea. Because of its high pitch, it could be heard over the activities of the crew and bad weather. It is now used in traditional bugle calls such