So, here are the basics: you can bring in bags that are 12x12x6 inches or smaller, which is roughly the size of a large purse or a small backpack. Anything larger than that and you'll need to leave it at home (or in your car, if you're feeling extra lazy). And, just to clarify, all bags are subject to search, so don't even think about trying to sneak in any contraband.
Now, you might be wondering what kinds of bags are completely prohibited, and the answer is: pretty much anything that's not a clear plastic bag or a small clutch. So, if you're planning on bringing in a large duffel bag or a cooler, you might want to think again. But hey, if you're feeling extra crafty, you could always try to sneak in a tiny snack or two (just kidding, don't do that).
One thing that's worth noting is that Pay Pal Park does offer bag check services, which is pretty convenient if you don't want to deal with carrying your stuff around all day. It's like having your own personal bag butler, minus the butler part. And, at only a few bucks per bag, it's a small price to pay for the convenience.
Der PayPal Park – Alles über die Heimspielstätte der San José