I pack my 19in Wetterlings alot. Its really not all that heavy, and carries well lashed to the outside of a pack. Axemanship is a woods skill that to me is very important. The felling axe is overkill for this time of year, but the SFA works well in all seasons. I suggest looking at the Wetterlings line too. Mine came shaving sharp, with great allignment, a perfect haft, and a cheaper pricetag. Bensbackwoods.com will hand pick your axe if you ask him. Ben knows what a good axe is. He carries GB and Wett.
http://www.bensbackwoods.com/servlet/StoreFront
A folding saw is the way to go if weight is an issue, but it needs to be a bigger saw. Hard to process large firewood with a folding saw, but for a summer campfire it will do the job. You can also split wood with a saw by cutting halfway through a piece and hitting it against a tree. Splits right on every time. Helpfull if its wet outside.
I still say Axe is king, and for the 1.5lb head, the total weight is around 2 lbs. Not much actually, and for the utility its worth it. Its a great axe that can handle even winter hardwoods. Ive put it to mine without mercy, and it has served very well. I do like a bigger axe(felling) for winter when the woods are frozen, but the 19in bushcraft axe or GB SFA does the job too.
If weight is a huge concern, for the summer months when wood processing isnt as big of a job as winter, a Tomahawk is lightweight and works well for me.
Hope ya find what you are looking for. Comparing an axe to a folding saw IMO is no contest. Axe wins every time. I would challenge any forumite with me and my axe vs. them and their small folding saw any day and I might lose a time or 2 to some of the more skilled members, but my money says Ill have wood and fire faster 9 times out of 10.