that's a smart idea. do you know of any Saw that's super long and folds also? i currently take bow saws with me but i hate having to run into the store n buying new baldes lol.
What size wood are you looking to process?
For the hiking/camping that I've done, I've never had to/wanted to cut anything bigger than ~7-8in diameter. I use a Corona folding saw. I think the biggest they make is 10in. Silky is another well known (perhaps the best known) folding saw manufacturer, while Bahco's "laplander" is another popular model, with I believe a 9in blade. As far as I understand though, these don't have replaceable blades. But they're relatively cheap, make quick work of wood that is in their size range, and are easy to carry.
There are folding bow saws, in the 21 and 24in lengths, and those work well from what I hear, although I've not tried one myself. Look at the Sven Saw, and the Bob Destrude Quick Buck Saw.
You can also just buy a bow saw blade, and make your own frame. I hear this is the preferred method for Mors Kochanski. He keeps a ~36in bow saw blade under his belt, and constructs the saw from materials around him when he gets into a situation where he needs the saw. I've only tried this once so far (while I was car camping), and I used a 21in blade, but it worked just fine. Took me about 15-20 minutes to craft the saw, and then used it for the rest of the trip. Then I just took it apart, and took home the saw blade (which cost ~$8 if I remember correctly). I'll be trying this again