Three 48-page memo books built for one job: fitting in a shirt pocket and surviving whatever happens to it there. The kraft cardstock cover is tough enough to handle a back pocket or a glovebox without curling, bound with a three-staple saddle stitch that lays flat from the first page.

Inside is bright white, acid-free paper printed with a light rule, graph, or dot grid, small enough to always be on hand and disposable enough to fill up without precious feelings about it.