worm proof plastic- what is it?

What is different about plastic to make it worm-proof?

Are any of the zip-lock type bags from the grocery store worm-proof?

Thanks in advance.

I don't know the answer to your first question, but within the context of your message, it seems like you are asking about plastic bags, whereas worm-proof is a property that is generally talked about in reference to hard plastic, like conventional tackle boxes or utility boxes.

Hope this helps.