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! 3.5" x 5.5" 140 pages Handmade and curbside recyclable. Like a fine wine or a good pair of jeans, your Tuk Book will get worked in and better with age. For best results, use a ballpoint pen. Not for use with pencils. **PLEASE NOTE: the Abstract Ocean and Red and Gold Wave versions no longer come with a cover elastic**