For the last year or so my local Wal-Mart has carried Aquatainers with the push-in plug vent. Today I went in and found there were 3 of them on the shelf with the more durable screw on threaded cap vent. I know they use to come with this screw on vent and then they changed to that crappy push plug. Does anyone know if they have changed back for good or did I just get lucky when I bought all three of them tonight?