knitting bag

Me again! Looking for a knitting bag for my SIL but as I'm not a knitter myself, I'm not sure if there are any particularly useful features I should look out for. Anyone got a nice one?
A Place To Discuss Baby Led Weaning
http://www.babyledweaning.com/forum/
http://www.babyledweaning.com/forum/viewtopic.php?f=8&t=56726