A gravity bomb that can be picked up and carried overhand by one man???
Either he's mighty mouse, or thier is something WRONG with this picture....
http://www.fas.org/man/dod-101/sys/dumb/fae.htm
This may help
I have no idea how much an empty gas shell weighs, same goes for those leaflet cannisters.
There is something about the pic that bothers me though. From the angle of his right forearm, it appears to intersect one of those fins, either physically impossible, or else uncomfortable to the point of arterial bleeding.
Whatever that is, it's light, no more than 20 pounds, I'd guess. His left hand is under it, but only under the centerline, not wrapped around like it would need to be for something heavier. His right hand is resting on it, not supporting it against the roll away from him his left hand placement would suggest if it's heavy. Relatively light, or Photoshopped.