Depends on MLB vs NFL vs Special event ie Monster Jam what the security protocol allows. MLB allows diaper bags no matter what, so if you're headed to an A's game your good to go, Raider on the other hand follow NFL security guidelines, clear bags of a specific size no exceptions... each other ever is up to the event the Oakland Coliseum has more info by event on the website
Any MLB stadium you can take any type of bag as long as they are not larger than 16"x16"x8. Now for NFL stadiums only clear bags are allowed 12x6x12 inches. Also clutches no larger than 4.5x6.5 inches. If you don't follow these guide lines and if you don't want to return them to the car, they will make you toss them.
Who knows? One of my biggest criticisms of the O.co is the lack of consistency. One time i could take in bottled water, the next time I couldn't. One time my wife's kiddie bag was too big to be allowed in, the next time it wasn't. When i spoke to a O.co customer relations person a couple weeks ago, she immediately got the point and sounded very concerned about establishing some consistency.
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