So, here's the scoop: you can bring a small bag, like a pocket-sized purse or a clear plastic bag, as long as it's not bigger than 16 inches by 16 inches by 8 inches. But, if you're planning on bringing a giant backpack or a duffel bag, you might want to rethink that plan. I mean, who needs that much stuff at a baseball game, anyway?
It's kind of like trying to bring a suitcase onto a plane - it's just not gonna fly (pun intended). The MLB wants to make sure everyone can get in and out of the stadium quickly and safely, without any hiccups or security breaches. Makes sense, right?