Just to confirm, cartos are simply pre-built atomisers with filler that may or may not have been prefilled with liquid. And even the prefilled ones usually can be refilled with loose liquid too you know - so it's not really 2 seperate things.
Myself I have empty unfilled cartos around all the time, in various secret hiding places in my car, bag, room... just in case my RBAs or tanks fail and I need a vape stat.
However, sometimes, carrying liquid alone is more inconspicuous than carrying just cartos. Especially if it's clear liquid in an unmarked bottle. Just stick medicinal label on it (nose drop - just in case they ask you to prove. Nico into nose is fine. Eye drop might turn you... blind) and you're done.
It's when you carry mods together with you into the cabin that the headaches start - though personally I haven't had much troubles myself while travelling around, but I tend to use my Vmod mini for travelling anyway.
That said, this is prolly where my old KR808Ds would shine. It + Innokin Clear10 clearos / smok cartos + pen cap = I can carry 4 in a shirt pocket, dump the whole lot into the xray machine tray and nobody bats an eyelid.
Anybody asks, it's a pen and I show them the pen cap.
Ultimate travel configuration. But unfortunately it's only "decent" vape wise and the batteries die REALLY quick.
TBH, I haven't tested it against our southern neighbours yet though.
good point, bro... thanks