Take a look at tis videoa that shows what the real NATO cans look like and the features they have. These don't look like the genuine cans.
Part 1: http://www.youtube.com/watch?v=WPYUjzdbhhc
Part 2: http://www.youtube.com/watch?v=aK2cxbDlVcc
The only place I've seen with these was charging 70 or 80 bucks. I'd rather a grocery bag full of water bottles compared to paying that much.
But if they were a reasonable price I'd be all over these.