I spent a huge amount of time testing every imaginable folding saw and hand chainsaws etc and carried one all the time
But I much prefer a proper bow saw if any real cutting needs to be done
they are simply much more efficient with regards to the amount of energy used to the amount of cutting done
however until recently every bow saw I came across was too heavy/large to pack and the folding ones too flimsy
And packing the blades into your Billy can where once knocked they can spring out as you remove the lid is as far as I am concerned complete lunacy
I have now sorted this problem though and have a lovely solid and extremely light weight (its a little over 9oz) folding Bow saw that takes up almost no space and stores the blades safely
Success is not measured by what you have, but by what you can do without.