In France knives are under the arme blanche category and theoretically there needs to be legitimate reason (being in the outdoors) accompanied by a hunters or fishing permit. Urban carry or carry for defence isn't allowed expressly. Yet the law here makes reference to bayonets, butterflies, extendable rods and other military/police weapons specifically. However smaller knives without a blocking mechanism are actively ignored. Equally, lock penknives are nothing, people have them on keyrings. The laws on the 6th catagory are not clear and the police, gendarmerie and customs all interpret them differently as legal cases have shown. Normally it boils down to whether the knife only has a lethal use and if the carrier is a scoundrel. Basically a small discreet knife without a lock is alright in France, if you want down to earth advise, but just don't cross a border with it, take it out in a city hotel or on a train. How any clean person is caught with a knife I couldn't understand. I met lots of knife carrying people in hostels and I'm sure there were more but just didn't know about they carried. In france you aren't going to be stop searched for nothing in the street, there's no need for those sorts of policies as people aren't getting knived to the same extent as countries with strict knife policy.