Messenger / Courier Bags List

I'm looking for a messenger bag. I don't do hardcore cycling, just knock around for the craic, I'll be using it mostly as a site bag, with all my site gear, locks, laptop occasionally & some stuff. I don't need to have a huge bag & don't want to spend a fortune. I see the Chrome bags get a good mention on here, so would the Crossair be a good buy?

http://www.chainreactioncycles.com/Models.aspx?ModelID=47605

I have this bag. It does have a stabilising strap but it's a little awkward around the waste. It's not big in comparison to a number of other bags but fits a surprising amount inside. It's waterproof, looks nice etc. I would recommend.