Hollis Underwater Notebook Snorkeling - Full Face Masks The housing's flat port features

The housing's flat port features a 67mm thread

ensuring manageable wear during scuba sessions

while the 1–2 mm thickness provides a lightweight layer for underwater gear and snorkeling adventures

The A700 Carbon Black Tech housing uses a full metal construction to optimize heat exchange for cold-water diving

allowing personal customization for a comfortable

Hollis Underwater Notebook Snorkeling - Full Face Masks The housing's flat port featuresThe Hollis Underwater Notebook is designed for scuba and diving sessions, providing a reliable place to capture observations, notes, and dive data during a session. Its waterproof pages stay legible when exposed to water, ensuring important details are preserved while exploring underwater. Included with the notebook is a pencil for immediate writing under pressure, allowing you to log observations as you move through your dive gear and environment.