If we are talking multitools, a Leatherman would do nicely and it has blade lock (beside a S30V blade, possibly depending on models). Depending on the country

If we are talking multitools, a Leatherman would do nicely and it has blade lock (beside a S30V blade, possibly depending on models). Depending on the country (and possibly in the US depending on states) a folding knife that can be opened with a flick of the hand/wrist may be considered illegal (switchblade or more accurately "gravity knife"). See: https://www.akti.org/news/california-appellate-upholds-653k/ https://www.akti.org/news/california-appellate-upholds-653k/ In some places there are also contrasting theories on the legality of the "lock open", i.e. a Victorinox multitool or an old Leatherman without lock would "pass" but a (say) Leatherman Charge/Wave/Surge would be border line[1] or just over the border[2]. [1] if considered "multitool" [2] if considered "knife"