Shocking the Fiancee with that backpack may be a fun thing to do . . .but being "quirky" that way is only cute for a little while.
From my vantage point of forty eight years of committed heterosexual monogamy, I would recommend that, for trips together, you start by getting a less tactical looking backpack. Little used modern looking backpacks may be found on e-Bay all day long. Same for the Goodwill online shopping website.
Why start off a relationship with friction? There will be plenty of friction rerdless as tie goes by. When traveling wih your intended to "nice" places . . .go with a backpack that doesn't make people think she with a wanna-be militia member?
I'm 48 years in . . .I'm just sayen . . . .
Modern travel backpacks have some cool features these days as well. All sorts of anti theft and sneaky tricks. That your survival set hasn't really considered.