Just a thought.....you know those long, skinny glass things that perfume samples come in sometimes? They are hooked into little folded cards that tell about them. They have a plastic cap, but not a drip tip. You might be able to clean one of those out......just a thought. Ever since I've started vaping, I've become a mod artist....finding cases to carry things in, various tools to use....various fillers to use....anyway, it's just a thought. I know they'd fit, just don't know if I've explained it enough for anyone to know what I'm talking about. And it wouldn't work for dripping, but it (I think) would work for transporting in a PCC and filling a cart.