Rite in the Rain All Weather Stapled Notebook (351/361/371/381/391)
Measuring 11.5 cm (4 5/8 inches) wide by 18 cm (7 inches high) they fit in any rucksack or bag. A mini version of this notebook is avaialable here.
The cover is durable enough for day to day wear and is treated with the same patented Rite in the Rain process so water just falls off. However, if you want even more durability then check out the spiral bound all-weather journals with super tough polydura covers.
Available in five page formats, Journal is ruled with quarter inch lines, metric grid is a 5mm by 5mm grid on each page, and universal is the ruled quarter inch lines with a feint quarter inch grid layed on top. Field pages have lines and columns on the left page for notes and a grid on the right for maps and drawings.
You can also buy a clear vinyl slip cover to give your notebook extra durability.
More information on Rite In The Rain can be found here. And don't forget that these products were just perfectly made to go together with Space Pens!