I think the Little Buck may be as functional as the Silky model you are considering (since they both have a 15 inch blade), though I have no personal experience with the Silky and have only looked at the pictures on the web you pointed me to. If you are doing trail maintenance and clearing blowdowns and such, you may want a larger bow or buck saw with a longer blade length than either the Silky or the Little Buck.
I'm not sure about the resharpening question. I do not personally have any experience resharpening saw blades. I'm going to be using Sawvivor 15" blades in my saws. I've tested them and they cut well, even on seasoned bone dry hardwood. I believe these blades have hardened teeth, and I don't know if that would make them more difficult to resharpen, though they may not get dull as fast either. You can get a new one for $10-$13.
I will be shipping the saws in 16" by 1.5" cardboard tubes with plastic end caps. These are on order, but I have not yet weighed them. These will be one option to transport the disassembled saw and spare your pack, though with a yet-to-be-measured weight penalty. A lighter way to transport the saw would be to wrap the blade in a bit of tyvek, nylon fabric, or plastic; if you use a rolled or folded CCF pad, the saw could also be carried inside that. The other saw components should not be damaging to a pack. A Tyvek blade wrap would be very light, probably on the order of 0.1 oz.
I am a strong LNT advocate. I personally never build a fire (other than a pan or mound fire) outside of an existing fire ring. I personally never cut standing wood. I am more flexible on the size of wood that is burned. This saw will be perfect for downed wood that is not a big log, but just a bit too big to break by hand.
I can certainly understand and respect those who never saw wood to make a fire, and/or never make a fire, never need to get warm by a fire, and/or don't mind waiting in the dark or by headlamp/lantern light for hours after dark before bedtime. This saw is not for everyone.