Two days ago I carried 60 or 80 pounds of books (didn't weigh it) on my bike for a distance of about 0.2 miles. I was gonna walk, but then I realized that it would be mighty uncomfortable to walk even that short distance with two really heavy bags of books, plus I might have accidentally torn the bags.
Today I carried one book and a coat the whole 2.5 miles to work. Same bike, and a wonderful utility bike it is. My favorite thing about it is that it's an easy way to get to work, but my second favorite thing about it is that it's an easy way to transport groceries. Another thing I like is that its waterproof plastic container keeps my stuff safe in bad weather.