Urinary Incontinence Support Group
Urinary incontinence is the involuntary excretion of urine from one's body. It is often temporary, and it almost always results from an underlying medical condition. Stress, functional, and urge incontinence are the most common forms. Share with other support group members and learn from their stories and experiences.
Hopefully there is an easier solution. Here is the phone number you need to call in advcance: Yankee Stadium Disabled Services: (718) 579-4510 (voice). Be sure to get the name of who you speak with, and don't hesitate to ask for a supervisor. It may be as simple as someone meeting you to tag your bag. BTW, actual diaper bags are usually exempt from the no bags rule, if there is a kid in your group and you can blur the issue!
Have fun-- I think a little advance contact will put your mind at ease.