I've had two, and can confirm excellent build-quality, and enough room for sandwich, thermos etc.
The comments about the catching of legs are interesting. The first one I got did this to me (5'8"), so I passed it on to a pal (nearer 6'6") who found it fine.
Mr Ogden then made me a second one, with the upper fixing-points for the shoulder straps lower on the case, so it was carried higher. That solved the problem.
A grand bit of gear. Should it wear out, I would happily have another the same.