The type of knife/tool you can carry around without scaring the sheeple locals depends alot where you live. I have an F1, a U2 and a LMF II lying in the window at work. It is a public building (the city hall och city office or whatever you would call it. In Sweden it is Kommunhus, where the city is run from) but it is a small town so no one cares.
Since 9/11 the regulations have skyrocketed regarding knives and related things, pathetic. Before 9/11 I could even bring an F1 in the carry on.
Anyway. carrying a SAK is totally sheeple, everywhere. People does not see it as a weapon, except retarded day care administrators. A LM multitool is not that common to the minions. If a minion carry one it is usually a cheap 10 bucks copy and they think it is as good as your 100 bucks Wave.
The same goes with fixed blade knives. A minion usually have one or two Mora clones that are really dull, unless he hunt. A hunting minion do usually also use cheap Moras, because they are easy to sharpen (which they need to do often), however they look down on you if you show up with knives like CQC7, F1, H1 or other high price knives. They will also probably destroy your nice knife because they treat it like it is worth 5 bucks.
To the minions a knife bigger and fancier than a red handled mora clone becomes a RAMBO knife in their eyes and hence a murder-death-kill-weapon and hence Verboten.
So even if you think your RAT3, S1, RC4, BK7, SRK etc feels just normal to you the minion behind you in the checkout stand at the grocery store.
If you wear hunting clothes or military uniform the knife "looks" smaller, if you have it strapped to your leg it "looks" bigger.
Get whatever knife you feel you need, just keep it in your bag until needed. If you need to cuts some seat belts or other "rescue" things I doubt people will freak out if you pull out your fancy 6" blade, but it is overkill just to slice an orange or such.