Going to Italy this summer and am taking my 20D and probably the 24-70L and the 10-22 lenses. I've never travelled abroad before with this camera setup, so I am wondering what is the best way to pack it for the trip. Do most of you pack your gear in your carry-on bag or do you pack it in your suitcase? Secondly, what bag do you suggest taking to carry the camera around while sightseeing? I was looking at the Lowepro Slingshot type of backpack...but I am not 100% sure. Any suggestions?