You need the "knife" in the bottom of the photo. Officially, it's a Meyerco "letter opener". All glass-filled plastic with copper beryllium springs, it's an assisted-opening device, legal in 49 states. (In Michigan, a secret opinion by the RAT attorney general decreed AO knives to be switchblades). Of course, $11 is a bit expensive for a letter opener.
If they find it by patting you down, remind them that it's a letter opener.
Actually, there are some VEY effective all-plastic blades. I carry one in my briefcase. I also have one of the middle knives, a Meyerco with a real steel blade, that I bought on a whim from a local sporting goods chain. They were selling them for about a month before they got a visit from the State Police.
