Yep - that fish weighs 33 lbs, or 528 ozs if you prefer. Don't think I'd want that strapped to my back all day! (Aside from the fact that it would start to smell pretty awful and would make my clothes all slimey lol).
(please note - the use of a fish as a visual reference is not an original idea, and I must credit it to Bryher - another good idea for her!).
So if you want me to be more original, 33 lbs also looks a lot like this:
Yep - a bale of hay. I remember how heavy these suckers were when I was hefting them around the stable yard as a kid. It also weighs approximately the same as the frame of a mountain bike.