Can u bring a backpack?

I just went oon 9/30. Yes you can, but they need you to Open it. No outside food. Only sealed water bottles.

Sometimes, depends on the venue.

Yes but they search it

I took my purse and a "Camelback" container for water and I had water in it and it wasn't an issue

Yes but not too big. You will also wait in a longer line for search http://www.livenation.com/venues/33640/fivepoint-amphitheatre

Nope. Very small purses are the only kind of "containers" allowed.