One step smaller than a bowie knife would be a buck 110. They are foldable and pretty heavy duty. I have used mine for digging roots and cutting back bark for sharis and air layers. But mostly, I use mine for home repairs and farm stuff. It is a little large for bonsai most of the time. If I am reaching for it, I probably actually need a saw.
Yes, I beat the crap out of it. It was my edc for maybe 4 years. It kind of wears holes in your jeans because of the weight. That is a common complaint. They were one of the most common knives in America back in the 70s. Maybe I will get a synthetic handle (featherweight or whatever) replacement one day.
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Bout 8 inches.