Depends on the country, but on many occasions I've seen precautions blown out of proportion.
But if you're worried about security, Pelican case!
Domke has a wood-plate in the bottom, and there are no zippers just clips so you will notice if someone's getting in there. Replace the strap with one from PacSafe that can't be cut.
Seriously? As long as you're not wielding your longest lens and your biggest body? Sometimes a 20D + 24-105 is just as inconspic. as you need. I use a shoulder bag, and keep it high on my waist / hip, on the side or around the front.
http://www.pacsafe.com/www/index.php?_room=3