Beach find from Cancun Mexico

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Hi Ken,
I have no idea, and so far my attempts to get an answer by posting this out on Twitter have generated lots of confused biologists but no answer for you. I will keep trying, in the meantime do post again if you have any further information (e.g., was it solid, flexible, rubbery or bone-like in texture, did it appear air or fluid filled etc).

Courtesy of Dr Alistair Dove marine biologist we have an ID for your strange object. It is the swim bladder of a porcupine fish (aka blowfish)

https://en.wikipedia.org/wiki/Porcupinefish

Apparently the swim bladders are quite tough and leathery and so survive intact long enough after the fish has died to occasionally wash up on our beaches!