<https://forums.geocaching.com/GC/index.php?/topic/381875-were-to-buy-real-waterproof-paper-not-rite-in-the-rain/#comment-6033623>
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"You probably mean Dupont Tyvek waterproof paper.  That's a type offered in A4 size.  You can't print on it with laser or inkjet, but some writing utensils will work.\n \n"
<https://forums.geocaching.com/GC/index.php?/topic/381875-were-to-buy-real-waterproof-paper-not-rite-in-the-rain/>