Since my last review the rules have gotten much more relaxed. That same bag I brought last time is ok (my bag was 1 inch too big last time and now they aren't as crazy about an extra inch). The stadium is nice and cool so bring a jacket if you are dressed for an AZ summer.
My only current complaint is that they have so few options for people like me who are allergic to hops. My allergy has been getting worse and worse to the point where even smelling an IPA can make my throat start to swell. For wines they have Chardonnay (ew!) and Merlot (my second least favorite wine- offer a Cab like everyone else!). The small kiosks that sell ciders and wine coolers are never open, sold out, or have the longest lines. I've been coming weekly for practice games and I see the drinks in the fridge cold and ready for customers to purchase, but they are closed. Move one person over there and sell me something other than shitty wine and beer!
I normally just get the Merlot and watch the practice while looking for a place with a nice wine menu to get dinner at once it is over. The things you'll put up with to make your spouse happy, haha.