Rite in the Rain All Weather Pocket Notebook (146)
These are the truly go-anywhere, anytime, in any weather notebooks. The pocket notebooks are conveniently sized to take with you on your outings. With a polydura cover, and the universal pattern, these 100 page (50 sheet) notebooks are perfect for any situation where you need to write in the rain or the wet.
This is a nice convenient size for a hip pocket at 10 cm (4 inches) wide by 14.5 cm (6 inches high). As well as the note sheets, the back also has measuring scales printed on to help you with field measurements of small items.
If you want a smaller version for your shirt pocket then take a look here.
You can also get a Cordura cover for this book.