Pull saws, if high quality, are excellent saws for woodworking and (if made with fewer teeth per inch than woodworking saws) can be excellent for pruning as well. An example of a 15" pruning pull saw is the Sharp Corporation 15" Fine Cut Pruning Saw. You can find pictures of it online. It has a removable pistol-grip plastic handle.
However, the weight of this saw is probably at least a half pound, if not closer to a pound. I've seen the shipping weight listed as a pound, but out of curiosity I have an email pending with the Sharp Corp for a more exact weight on the saw as well as its replacement blade, which I'll post when they respond.
Meanwhile, the Little Buck 15" blade, as thin as it is, weighs about an ounce all by itself. In theory, you could carry just the blade and a piece of windlass cord with you and whittle and saw wooden bow saw pieces out of wood to create a saw. So much trouble, but that would be very light (except the knife you would need to make the saw components).