I probably should have measured this first but it was SO much bigger than I expected. That being said, it's amazing at hauling things around and I feel comfortable loading it up. However, I don't know if it can actually handle 450lbs. One of the corners has already begun to tear for me and I can't imagine I've had more than 100lbs in it. That being said, I doubt most people buy this expecting to carry the equivalent weight of several human beings... So if you're just looking for a massive "stuff" hauler, this is perfect!