I am most impressed with the Silky Zubat pruning saw, if I had to bug out I would take it in my bag. It's "workshop" equivalent is generally known as a Japanese or Jap Saw, but these have finer teeth and will clog on green wood. Stanley make a Jetcut saw with similar teeth ( pic below ) that would make a good cheap alternative to the Zubat.
These saws all cross-cut extremely well, however they are not easily sharpened and the lack of set means that they can jam in deep cuts, the angled tooth point means that they don't cut with the grain too well.
A robust general purpose saw that I also use at work is the Bahco 244, the blade is slightly thicker than the average hard-point saw, so you can use the tip in confined spaces ( like boats for example ).
Here's a pic of the teeth from the Jetcut, very similar to the Zubat.
https://www.jastimber.co.uk/images/pictu...large).jpg