 approximately 4 1⁄2 by 6 1⁄2 inches. That's usually what Alex takes. We go to the fair or some concert, she takes her little clutch bag with her so she can put her ID and stuff like that in there. What is prohibited, all purses and bags larger than a clutch bag. Backpacks will not be allowed. Camera bags will not be allowed. Coolers and luggage are not going to be allowed. I mean, that's just common sense. That's all about safety.