After being stopped every single time I entered a park and being told each and every time that I needed to remove my eyeglass case and camera (had already done that), I had enough. When re-entering Epcot at a very quiet time and being screened again, I had the security guard remove everything "suspect" from my Baggallini and left the items with him and my husband. I walked through the scanner again and yep--it went off.
We then removed everything from the bag--ding, ding, ding--went off again. No one has an answer why this bag (pictured in my avatar) continues to sound the alarm. They say that it is my chest area raising the machine hackles. The bag has a zipper in the crossover portion of the strap which would be in that area. There are also heavy metal rings that allow for adjustment. Security said no, that wouldn't cause it--no resolution for me unless I ditch my favorite park bag ever!
I have resigned myself to additional screening and listening to the same spiel each and every time--"it is your eyeglass case" or "it is your camera"--I gave up removing them because it makes no difference.