The Tuk Book™ is the world’s most durable notebook. It is made entirely out of Tyvek®. It was designed to be your companion, no matter what your day entails. It is waterproof, tear-proof, and incorporates a patented binding system that allows it to be bent without damaging the binding or sheets. Wear it in your back pocket or throw it in your bag – either way, don’t worry about it!