Tyvek, the stuff of Fedex envelopes and This Old House product placements, seems to be a happily indestructible alternative to paper, which the kid loves to chew on (and turn to mash, and incite a panic when we realize 15% of that napkin we just grabbed away from her is missing, oh no, she's gonna choke on it, quick fish it out. eew.)
Buy Tyvek envelopes at Stapl-- are you kidding? They're free in every supply closet and at the Post Office.
Thought you'd like to know that books that go with the Little Touch LeapPad by LeapFrog, for kids 6 mos to 36 mos, are made of Tyvek pages for this reason. You can even re-flatten them with an iron if your kid crumples the pages. (Use a dish towel between if you are thinking of setting iron to paper!)
P.S. Not claiming to be a savvy consumer; I work there.