(Written by Ken Crawford)
The webpage describing this change has slightly more precise text than the e-mail I received:
A backpack is considered a bag worn on or over your shoulders. It can have one or two straps and have one or more zippered pockets. Both adult and kids backpacks are not allowed.
So, it looks like it’s still a question of whether it is designed to be worn over your shoulder, but they seem to be implying (the word “can” leaves them wiggle room) that if it doesn’t have either an over-the-shoulder strap AND at least one zippered pocket, it’s not a backpack. So a bag that you put over your shoulder that is open ended (without zippers) or perhaps has snaps or a drawstring opening wouldn’t count. But it also looks like a fanny pack or a small duffel that has zippers, as long as it doesn’t have an over the shoulder strap, would be OK too.
And so I ask this question: In what way does this “enhance public safety and improve stadium access” or from elsewhere on the same page “create a safer environment on game day”?