The only knife I've really ever carried back pocket is my M1 Lightfoot (back left pocket).
old pic from when it was newer
I tried other knives and had the same issue with the clip catching on furniture and such, but the nice broad and rounded tip on the clip of the M1 doesn't catch anything. I carried this way with the M1 for probably a year straight and never had an issue. Still makes it's way into my EDC from time to time (still carried in the back left pocket too:thumbup
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-sh00ter
old pic from when it was newer
When I worked armed security, I would carry my Spyderco Endura in the back pocket due to my holster covering my front pocket. I carried it there for 5 years with no issues other than the clip getting caught in the fabric of some chairs and coming out if I was not careful.
I tried other knives and had the same issue with the clip catching on furniture and such, but the nice broad and rounded tip on the clip of the M1 doesn't catch anything. I carried this way with the M1 for probably a year straight and never had an issue. Still makes it's way into my EDC from time to time (still carried in the back left pocket too:thumbup
-sh00ter