I'm in love with this Journal Bandolier made of recycled bike inner tubes, made by Cleverhands and sold on Etsy. The bandolier is a strap fitted with small loops for carrying pens, pencils, and other handy tools wrapped around a journal, planner, or other book. I ordered one for the small 3.5" wide Moleskine. Bandoliers for other notebook sizes available as well.

http://www.etsy.com/listing/80431666/mini-bandolier-replace-your-pencil-case