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So no kind of available plastic is a safe choice? And Tyvek is a very interesting material. Slick, strong and very smooth. But how do you make a sleeve from it? ----- Original Message ----- From: "Mike Richter" <[log in to unmask]> To: <[log in to unmask]> > > Apart from the issue of cost, I'd recommend Tyvek. Short of that, paper. > > Mike