Yes. At the airport you will have to go through security, of course. Many public buildings, especially those government-related, have security screens as well. At ball parks, stadiums, and entertainment venues, they will look through your pack. There are some concert venues that don't permit bags, but that will be specifically noted.
Hope that helps. almost 8 years ago
Subject to the usual security screening processes, you should be fine.
Some buildings, from time-to-time prohibit knapsacks, but usually provide a bag check service.
(Note anyone travelling to Commonwealth Games in Delhi this 2010 summer: NO BAGS at all in venues.)
Just don't EVER leave a bag unattended, that will cause security to come down on you very heavily, it could cause evacuation of the airport/building and it will be very embarrassing. Plus, your insurance doesn't cover anything you lose if the bag was unattended. almost 8 years ago