There are certain things I like to always have on me, and carrying them mounted to my boots is the easiest way. I don't like having a lot of stuff on my belt or in my pockets, nor do I want to carry or wear any kind of pouch.
Everything I carry gets used, and has gotten me out of a jam at one time or other. My pant legs cover everything, so nobody can see what I'm carrying.
What you can't see in those pics, and what I didn't mention (because it's not unusual) is the Leatherman P4 in a pouch (pic below). That's come in handy too.
As you can see from the pics the boot uppers are rigid, so they do a good job of supporting the weight of the items. I've been carrying items like this for decades on several pairs of boots (hence the wear and fading of the Leatherman pouch and pliers holder).