From my understanding it varies from airline to airline.
I’m looking at the Air Canada page that has details for example which can be found here.
But I’m not sure certain what it means.
Can I have a portable power bank that’s 160W? If I bring that could I also bring on a laptop and a Steam Deck?
It seems like you can bring 15 devices theoretically.
Ive never had any trouble flying domestically here with a laptop or a power bank.
But they do make you take it out of the bag for separate scanning.
I fly with westjet if that matters.