Last washday, while brushing lint out of the pockets of DH's Carhart pants, I discovered that the restrained double row of straight stitching on the back pocket isn't merely decorative: the bottom of the pocket is double, and the stitching secures the top of the partial lining.
But my pockets wear through at the top, where I rub them putting things in.
I just checked my ragged old jersey, which I kept in case of emergency, and the pockets are all in perfect condition except where the hem of the keychain pocket has worn away to expose the elastic inside. I'm pretty sure I have had pockets leak at the bottom, but none of them are still around. On the other hand, I've seen back pockets in DH's cheaper pants wear through just where these pockets are reinforced.