Secure storage during weddings for wedding photographers

[haring]

I would like to buy a bag in which I can securely store my lenses and back up cameras during weddings. What do you use?
I know assistant is the solution who can watch your bag but a lot of time is is just not feasable. Also, I can carry all the cameras and the lenses on me but it is impractical a lot of times...
What I am looking for is something which is hard to take from the without somebody noticing it and I can lock it.
Somebody suggested that I can get bags which have an alarm...
It would be great if I didn't have to worry about my stuff all the time.

I appreciate your help!

[danchez]

do a search in the Equipment Talk thread, all kinds of good stuff there.

[S-Man]

There was a thread in the Weddings section about thieves at weddings. Many endorsements for the Think Tank Airport Security bag.