The places on the camera where any strap will attach have very small holes so only a very thin string can fit through. I've read many reviews of various brands of floating straps and many people have lost their camera because that string that attaches the floating part to the camera broke.

I'm guessing that these people who lost their camera had the strap around their arm or wrist and were not holding on to the camera itself while swimming. I've done the same thing when I used to buy those disposable Kodak underwater cameras that use a heavy duty rubber band for a strap.

Since I plan to actually hold the camera in my hand while snorkeling or taking pictures in the surf, I wanted the extra protection of a wrist strap. The wrist strap that got the best user reviews - concerning the strength of the thin string part that attaches to the camera itself - was the Nikon AN-CP19 Replacement Strap. It's available at Amazon for $5.95 as of this writing.

I tried the Lexar 128GB SDXC without knowing the reference made on Amazon. I didn't even get a chance to TRY and format it in the camera. A message popped up and said "This card cannot be used." That's unfortunate, but I read a reference in one of the OTHER posted questions here, that card write times slow down as they get full. If that's the case, maybe it's better to go with several smaller cards? Just a thought.

I've put a wrist strap on the camera for underwater use. The strap is short enough to be secure on my wrist and not slip off around my hand.

Yes, you can