I was wondering what to do with valuables on excursions and came across this anti-theft bag. If not this bag, what do people do? We are only doing beach type excursions so will be in the water most of the time on Cozumel, Grand Cayman and Jamaica. I normally leave my stuff on the lounge chair and take my chances but don't feel comfortable in these countries. At the very least you need ID and room keys and some cash/cc. What do you do?