I know it's been asked several times previously, but what backpack would you recommend? I'm looking for a bag I can take into the field with me everyday that will hold one body, one super telephoto, one other mid-range or short lens, and the usual cleaning tools, extra batteries, etc. A bonus would be the ability to hold a laptop for when I travel by air. I currently have an okay ProMaster bag that's been fine over the years, but it's getting a little ragged and I'm looking for a replacement that's better quality and perhaps more versatile. Any suggestions would be much appreciated.