Waterproof outer mahjong caseUniversity‑of‑michigan‑campus‑cultural‑student‑organizations‑in‑Ann‑Arbor‑hold‑well‑attended‑mahjong‑game‑nights‑that‑draw‑large‑numbers‑of‑students‑wanting‑to‑unwind‑socially‑after‑long‑weeks‑filled‑with‑heavy‑academic‑study‑work‑loads.