so i bought this pocket chainsaw.
it is very cute, which you know is important to me. the blades are sharp, but because it's a chain it has a wider cut than a bowsaw, so is slower to cut. the good part is that you can sling it around just about anything and start cutting.
it's not expensive and it doesn't take up a lot of room in your stuff, even though it's not terribly lightweight. it's a nice addition to my kit.