Zip Lock Bags

So I’ve been to two Astros games this with my two kids. 1st game spent well over $300 on Food,Parking,Tickets Drinks etc. Next game I found out you can bring clear gallon size Zip lock bags with food in them.Had one bag with a 20 pieces meal from McD and the other Two Banh-mi sandwich’s and Crackerjacks. Total second game $ 125