Moose stand 7 to 8 feet tall at the shoulder, are 9 to 10 feet long, weigh 1,200 to 1,800 pounds and where there is a high concentration of them, there are still large amounts of ripe growth available to them and other animals. They run up to 35 miles per hour.
Brown bears are 4 to 5 feet tall at the shoulder and 8 to 10 feet tall when standing on their hind legs. They weigh up to 1,500 pounds and can run 35 miles per hour and can kill many moose, caribou, elk and deer in a year.
So, I don't find those descriptions of sasquatches ridiculously far fetched, just somewhat exaggerated due to witness perception.