I have lots and lots of the Strathmore Visual Journals, my favorite is the 5 1/2" x 8" Mixed Media Journal. A perfect carry around size, works great for my Zentangle® art, Inktense pencils, colored pencils or simply sketching. The Strathmore Visual Journals are also available in 90lb and 140lb watercolor paper. Both papers are a little thicker and great for watercolors, I don't like them as much for Zentangle drawings because the Micron pens I use don't seem to hold up as well on the rougher paper.
Preliminary sketch with circles, mustaches, eyes and eyebrow.
This is a fun exercise I did in my Strathmore Mixed MediaJournal using circle templates and hand-drawn Zentangle mustaches.