Can I bring alcohol from Canada to the US at 19?

I know underage drinking is illegal in the US. I just want to know how strict the checks are when going from Canada to the US, like how thoroughly do they check bags, what do they check exactly, and what about weed? It’s a genuine question, and I don’t want to hear “you shouldn’t worry about drinking at your age” or anything. Experiences crossing the border is appreciated, related to the question or not!