It wouldn't look so dorky on a boat though. A kayak with one of those mounted on it would be a slick little boat.
That it is made to be worn as a backpack, and long as it is, mounting it on a canoe or kayak might would cause stability problems...but a least it wouldn't be pulling you under when you went into the drink.
Next, when, inevitably, it started sucking water instead of air, you might decide that a low thrust electric trolling motor was a better alternative. Especially if it were salt water being sucked; engines think that really sucks big time.
At $900-2,000, instead of becoming Super Dork, why not buy a good, used powered two wheeler of one sort or another?
Twenty pounds of screaming 2-stroke hanging on your shoulders? Yech!
Oh, and don't twitch when you reach for your water bottle!