08-24-2017, 05:15 AM
ewa-marine makes underwater bags. Long ago I had one for the same purpose, They are watertight, clumsy to handle, cheaper than a new GoPro and "get the job done". In that price range I don't know much better. Nikon makes an AW-1, if you're not allergic to Nikon. No idea, if that's for submerging (they say so, but Olympus does as well...) or for an occasional splash.