I was very fortunate to be able to knit the Raspberry Wheat Ale Messenger Bag from Pints and Purls for Knit Picks Fall 2009 catalog. The bag was knitted with Wool of the Andes in Dune Twist, and knit up fairly quickly on size 6 needles. The pattern calls for larger needles, but no matter how hard I tried, I couldn't get gauge with anything larger. I seem to have become a bit of a loose knitter when I wasn't looking.
This would be a perfect knitting bag. It is large enough to hold a sweater, and the pockets would keep everything well organized.
The bag is knit in pieces and sewn together before felting, with the back pocket being sewn in after felting. I love the ribbon detail! Plenty of room in that pocket for a pattern and some accessories.