http://ilbob.blogspot.com/2012/03/packaging-weight.html I did a quick weighing of some canned food versus pouched food. As I suspected, comparable canned food items versus pouched items I just happened to have available to weigh showed there may actually be a weight advantage to the canned foods.
_________________________
Warning - I am not an expert on anything having to do with this forum, but that won't stop me from saying what I think.

Bob