The Texas 5.5 inch law that also specifically mentions a "bowie knife" as an "illegal knife" is likely a holdover from many years ago when the bowie knife was kind of the feared "assault weapon" of its day in the South and Southwest. Mississippi still classifies "bowie knives" along with firearms as weapons that a convicted felon cannot possess. Up until 2003, Florida still had a law on its books that specifically made it a crime to sell a "bowie knife or Winchester rifle" to a minor. Before this change in the law, I always thought that it would be an interesting defense against charges of carrying a "dirk or dagger" concealed in Florida to argue that what you were carrying was, in fact, a bowie knife which, by law, was considered different from a dirk or dagger. They plugged that hole in 2003, but it would seem that you can still carry about anything openly.