Weighting your posts will help ensure that they don't migrate on you and either become derelict or become inadvertent illegal pots fishing out of season (look for that ticket in the mail if LE finds it and you haven't reported the lost pot).

I have a brick in one, a chunk of steel in another, and the newest find - plastic covered barbell weights (2 1/2#) - in two others with those snugged in place with plastic zip ties. Lead weights from old dive belts work great but I am saving those for shrimp pots.
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Remember to immediately record your catch or you may become the catch!

It's the person who has done nothing who is sure nothing can be done. (Ewing)