re: Plastic Flasks into stadium Question

It couldn't be easier. Used to do it all the time but don't really bother anymore since they sell beer now.

Would slip squeezed water bottle full of whatever into my pocket and just walk in.

Only one time did I ever come close to getting busted. I was a little careless and had it sticking out of my pocket. The ticket lady said what's that in your pocket. I ignored her and just kept walking and didn't look back. They really don't care