For box
mods I've always used Vape Sox for 'on my person' carry. It's been forever since I bought mine, but they did come in many different configurations, sizes and made in different materials/colors back then. This particular one (that only has a carabiner for carry - no belt loop/clip) can accommodate either one or two box mods with atty's ready to vape. But I only use it for one (and do not need to carry extra
batteries or joose). The main pocket can hold a
mod as big as a Dovpo Topside/Digiflavor Mesh Pro atty with ease (for example), the front pocket is more ideal for a Pico.
Vehicle carry I use console drink cup printed mod holders. I had one custom printed to hold two of my six Pico's for wee hours of the night errands back when I still used them. Custom because I didn't want the one Pico with spare battery and refill bottle ability the standard ones were always made with.