You can't beat the size of these great little notebooks!  I needed my own "little black book" to carry with me daily for writing down ideas as they popped into my creative and impulsive little head.  I could find nothing "pocketable" in a pair of jeans that didn't stick out and add bulk until I stumbled across these small "Volant" notebooks by Moleskine.  I'll probably have to switch out my current book before I finish writing in it simply because the covers and pages wear from rubbing against everything else I stick in my pockets, but there are plenty of pages in each one for jotting down tons of ideas, lists, contact info and "to-dos".  The fact that they come in a 2-pack is a huge bonus!  Highly recommended.