I need to get a new handlebar bag for an upcoming trip but I need some help choicing a good quality one at a good price. I am on a budget and am looking at some under $50. Does anyone have experiences good or bad with say the Topeak, Cannondale or Nashbar bags? I want a bigger sized one that runs about 470-480 cubic inch. It would be nice if it was waterproof but unless I go to a higher end bag that probably won't be possible. I also want one that has a quick release mechanism and a map window. I'd prefer not to have a velcro strapped one. Thanks for any help you can provide.