I was listening to a podcast recently and heard that some of the most expensive repairs are the result of sand getting into your gear.  Traveling to the Caribbean, I am familiar with the fact that sand gets everywhere.  I have learned not to change lenses at the beach, and am careful in cleaning lenses afterwards so as not to grind bits of sand into the lens coatings.  Having just invested in a very nice tripod (read more about the tripod I selected here), I wanted to do what I could to minimize sand and seawater getting into the locks.  In the past, I had resorted to using plastic bags…