Yep, every field I can think of that I've been to in Ontario no longer allows barrel plugs, you have to use a bag. Many of them even have signs posted saying exactly that. Once in a while you see someone using a plug rather than a bag, and once in a while those people get away with it (probably because they're clearly adults and look experienced enough to not be an idiot about it), but for the most part, plugs are no-go.
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