Is this true? If so, it must be new in the past year.
From a review: "Oh, a quick warning to travellers--Cozumel Airport Security will not allow you to carry-on travel sized liquids in a ziplock bag bigger than sandwich size. We watched as they threw out the toiletries of passenger after passenger who packed a quart-sized ziplock. They will let you buy baggies from the airport pharmacy for $1 each (!) but will then only allow one per passenger, and confiscated two extra ziplocks that my husband purchased unknowingly, essentially stealing 2 dollars. The woman was so nasty to us, my daughter was in tears. Such a contrast to the folks that run El Cozumeleno and such an arbitrarily mean thing to do when Mexico needs ambassadors more than ever. "