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bucksaw, but I think you might want to rethink your hunt for the lightest. Wood pushes back a little...and in many situations you might not have the opportunity to stand directly by the object for cutting. When one has to do the cutting with arm extended a little weight will help your wrist in steadying the blade for a smooth stroke without bouncing...fwiw. Not to oppose any of the previously mentioned...most are made pretty well.
Being a traditionalist, I went with a wood framed pack bucksaw from Sanborn Canoe. More money than my sven saw, but should last the rest of my lifetime. I still carry the sven for backup.
consider getting blades designed for cutting dry wood, not green wood. Most saws come with blades with intermittent non cutting teeth designed to rake out green saw dust from the kerf. When you are cutting dry wood, which of course is 99% of the cutting canoe travelers are doing, you do not need to have unproductive non-cutting teeth to rake out the kerf and saw blades with out those teeth - ie. all cutter teeth - are significantly more efficient. Makes a difference over a long trip with daily firewood cutting.
If you can't find the blades locally (it can be hard to find them) you can order here - http://www.fastbucksaw.com/.
UPDATE - these drywood blades are often called "peg" blades. Turns out fast bucksaw may not be shipping with peg blades now. I just received an new one and it has a green wood blade with raker teeth. But - you can find a replacement blade if you search for Bahco. There are folks who prefer the all around functionality of the raker tooth blades - but I find that for my purposes on a canoe trip the peg tooth blades save me a lot of time and effort over the length of the trip.
g2d, whether sincerely or facetiously; here's what we found to be the best for use in the rocky, rooty conditions in Quetico Provincial Park camp. For many years we used those plastic trowels then one year someone broke it. Not a good thing when you're on day 5 of a 9 day trip and there are 6 people sharing it. So Darryl covered the new one with fiberglass cloth and epoxy. One industrious member of our party managed to break that one too a few years later. We came on a great replacement when visiting Johnnie's Seeds of Maine: a small steel gardening trowel (blade is maybe 2 in. wide by 6 in. long). Twenty years and many cat holes later and it's in good shape. It even has a nice leather cord attached to the handle.
OP: We've used the Sven saw for years and it's held up great, with an occasional new blade. I made a case of 4-mil plastic and duct tape with a tie cord on top and keep handy tied to outside of my pack for use on portage trails with downed trees.