I remember going to games as a kid in the late-70s and early 80s. My buddy and I (and tons of other kids) used to collect the empites for the ten cent deposits while our fathers finished off their beers. I don't remember coolers, but there must have been given the number of cans, bottles, etc.
As for 89, I was a freshman. I can tell you that wine skins were as much a part of the student dress code as maize t-shirts are now. In theory, we had to hide them. However, there is no possible way we were that clever that we never got caught. I also have a specific memory of that year when I was tasked with smuggling in some of the wine skins for the frat I was pledging. Like a fool, I put one down on the seat and it fell into the aisle. As I picked it up, I saw an usher looking right at me with the thing in my hand. I was stone cold busted. The usher just smiled and gave me a thumbs-up.
The cops on the outside of the stadium were a different story . . .