+1 on the Silky. I've carried a Sugoi for a couple years now and it's a fantastic (though pricey) saw. A simple 13" Corona pruning saw is cheap and will readily cut small stuff up to 8" or so. Can't beat the weight, but if you've never used one, they cut on the PULL stroke.

I've single bucked some pretty big trees on logouts, but in those cases I went into the woods with a larger saw knowing I'd use it. If just hiking around, I leave the crosscut in my truck and carry the Silky.