I've had several opinel, fine knives, but I've found them a bit fat and bulky
for carry. Mostly around the homestead, I carry either an old rebuilt Broderna Jonsson or a customized Jarvenpaa puukko. For pants pocket carry you might
want to look at the Eka folders. Inexpensive, good steel, take/hold a good edge and slimmer than the opinels.
http://www.ragweedforge.com/eka-catalog.html
I assume there is a source for them in Europe.
Rich S