It's big, so I stuff it full of stuff, just in case. Only I never use 99% percent of that stuff. Mostly I just use my pocket moleskine and my Staedtler Pigment Liners, and occasionally my Sakura gel pen or Bogus pad. So I decided to streamline.
This one is the perfect size for my pocket moleskine, my regular moleskine, some pens, my iPod and nothing else. It's a lot easier on my shoulders, less conspicuous, and just plain easier to keep with me. I'll draw my other, slightly larger map-case-style bag sooner or later.