Rite in the Rain All Weather Mini Stapled Notebook (371-M/391-M)
Measuring 8.5 cm (3 1/4 inches) wide by 11.5 cm (4 5/8 inches high) they fit in any pocket. This is a small notebook, a larger version is 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 two page formats, Journal is ruled with quarter inch lines, whilst universal is ruled with quarter inch lines with a feint quarter inch grid layed on top.
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!