This notebook uses Rite in the Rain's specially treated, fully recyclable paper with their "universal" pattern, which is a wonderful combination of lined and gridded, making sketches and writing equally easy and readable.
The Seattle on-site architect's dream notebook.
This is the full-sized book, with a grid running almost all the way to each edge. For larger sketching or detailed drawings, this is an excellent choice of notebook.
Because it's their all-weather paper, you won't have to worry about sweat or rain being any trouble.