The door security here is one of the strictest I have ever experienced (of course, it depends on the person). So far, they haven't cared much about the size of the bags, but they have asked many people to open the smaller compartments inside. Absolutely no cameras are allowed except very small compact ones or cell phones.
Today I was told that you can only bring one bag (I had two and a small handbag), and when I showed them my flags, banners, blanket and stuffed animals, and asked her how I could fit all of these in one 30x20 cm (12in x 8in) bag, she just told me to go to the storage place. I think they have never watched a skating event.
They also tried to control the entrance to each section by checking your ticket (as more people came, this became less strict), but they did not control the kids standing on the stairs near K&C and screaming for autographs during the practice even while the run-through was going on. Once the competition started, things were more controlled, though.