It looks like a premium product - but its at a budget price. It easily accommodated 15" laptop, power supply, cables, mouse, 10" tablet and several magazines when I took it away with me on an overseas trip recently.
So far it seems durable but I haven't had it long enough to know for sure. Similarly, it has not been out in the rain muc, so I can't determine quite how water resistant it is - hence only 4 stars for those attributes.