Backpack designed for carrying equipment. It offers protection against moisture thanks to its materials and design. The main compartment is accessible via a roll-top closure system that ensures increased watertightness. A front zippered pocket allows quick access to small items. The straps are designed to provide optimal comfort even during prolonged wear. A purge flap allows air and water to be evacuated from the main compartment. An integrated safety whistle on the chest strap offers additional safety.