This is the nicest bag I have used for tooth hunting. It doesn't snag on everything like a mesh one and the smalls you find don't get caught in it.
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My buddy and I recently booked a charter to the megalodon tooth ledges off Wrightsville Beach NC.
Was just out on a meg charter there about a month ago. Charter instructions were to tie off on the anchor line for all of the reasons that @Tracy just stated. Also any rock that you might find sticking out above the sand for a secondary tie-in has a chance of being blown away by another diver using a DPV to do some digging.
Which is actually something that I would recommend you consider. Waving your hand is ok, but using a DPV is a cheat code for teeth. Another option would be to look at something like a swimming paddle for your hands. One of the guys on our boat had a custom metal one but one of the Speedo ones would be pretty good too.
Oh and I know you already ordered a bag, but threw a bolt snap on this one from Amazon and it worked great: https://a.co/d/0e41uCml