I own a couple of ESEE 5 knives and several Fallkniven F1s. Got them to evaluate the designs. The ESEE is big, thick, and heavy. I can't really imagine a pilot wanting to carry it and sidearm & other survival kit. I also think an exposed steel tang isn't a good idea on a knife that might be needed in extremely cold weather, possibly without gloves. - - There's a sheath in plastic offered for the F1 that is rectangular in shape & sometimes knife hobbyists complain about it not being 'more form fitting'. Its designed that way for a purpose. Ever try to get a knife out of a sheath where moisture has accumulated and now its frozen stuck ? And ever try to keep gear in good condition in wet conditions, including Alaska ? Stainless steel/synthetic stocked rifles are popular up there for a reason. The F1 is a well designed knife that would likely work well for a pilot IMO. Not only would it work in an arctic environment- it will work in jungle or desert too.
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