Most places we go require clear bags, so I didn't have a choice. Found this Adidas Festival bag in a charcoal tint, so it's technically clear, but gives a bit more coverage.
If we didn't need a clear bag, then I would probably use something small, lightweight, and easy to clean like nylon or leather.
Thanks luckily in canada we dont need our bags to be clear
Debatin my stoney clover scrunch which matches team colours versus my black tory burch crossbody
Most of the venues I've been to allow a larger (12x12x6") clear bag or a smaller (5"x9" or 5"x7") non-clear bag.
I usually just bring my Gigi City wallet - it's a zip-around with a detachable wristlet strap and has a front pocket for my phone. Also enough room on the inside for lip balm or other small needs. 7.5"x4"
If the stadium policy needs something smaller or is ambiguous, I bring a cardholder or billfold wallet and a dress with pockets for it, lip balm, and phone
As a "purse girl", I'm sure you can all relate to feeling kinda naked without a proper bag!