The new Pen Holster fits all standard sized Notebooks, Bound Books, Field-Flex Books and Loose Leaf Binders. It's perfect for keeping your writing utensil safe at hand! The Holster has an adjustable velcro and elastic strap for easy resizing. Fits One 4 5/8 in x 7 1/4 in Bound Book or 7 in Spiral Notebook. It also can double as a page holder or bookmark! You can also wrap the Holster around the exterior of your book to keep it closed in the field. Made with tough, black CORDURA® fabric. (pen and book sold separately)