Springfield 45acp IWB . . couple spare mags in my back pocket . . but wait, you want to know about my vape stuff . . right?
I use a cell phone pouch with a belt clip for the MPV and/or the VTR, they are usually topped with an AeroTank and the most likely units I take when out and about.  Many times I just put them in my pocket, I tend to wear cargo pants, lots of pockets.  I live a couple miles out of town, if I might need something I can usually just deal with it when I get home.  I'm self-employed, my business is located at my home, so I really don't need anything more than my basic immediate vape needs when I am just sticking around home/town and just going there to get the mail, or a short visit to the feed/hardware store, maybe a meal at one of the 3 restaurants, that's about all the places my small town choices offers me.  Anything more requires travel.  Bare essentials are just fine.  After that, preps are the name of the game.
I have a large ego zippered bag that I keep in my glove box - have a u-can with extra 
juice, couple 
coils, couple spare 
batteries for the VTR, charging cord for the VTR and a small one batt charger for the VTR and an empty spare AeroTank just in case I might break the one I'm using.  I carry all that when I am making a trip out of the small town area where I live, a bigger town is 85 miles one-way, and if I am going somewhere to seriously shop it's a 3 hour trip one way. IF I had a vehicle problem and had to stay gone for a day or two to get repairs done, I want to make sure I at least had my vape stuff covered.  I could do fine without it, and NO, I would not buy a pack of cigs to get through not having my gear, but since it's easy to put all that in the ego bag and have it, I take it.  I also carry a bug out bag in my vehicle with a change of clothes, spare pair of shoes, jacket and so forth just in case as well.  I usually a small cooler with some bottles of water and a few snack bars, I keep it cool with those nifty little freezer packs, if it's really hot out I can put my ego bag in the cooler.
So, I have all my bases covered with a few little easy to go down the road necessities.  I have on one occasion needed some of the stuff I carry, it was a good thing I had them.  I travel light with what's on my person, but I always have stuff to meet my needs when out and about.
CD