I carry a fixed blade knife, like the excellent Amtac Blades Northman, daily. I am comfortable doing this and I live in a place where it isn’t at all unusual to see someone with a knife on their belt (though mine is concealed). However, I also acknowledge that there are settings in which it would be strange to use a somewhat large knife (large relative to most people’s perception) to trim a string. It can be a good idea to carry something smaller and more approachable for common tasks… something like the 5PK Fifth Pocket Knife.
The Fifth Pocket Knife is small enough and typically brightly colored enough that it will not register as “scary” to just about anyone. These machined aluminum utility blade holders slide easily into your fifth pocket (hence the name) and accept standard utility blades so you don’t have to worry about resharpening.
The Fifth Pocket Knife weighs a scant 15 grams. It is available in a variety of colors and it is made right here in the USA.