CarolKing, I was looking at one of those from PV, was thinking I could attach it to a whip, could keep the solo in a pocket or something and take sips out of the whip. I'm trying to find a way to vape in public (like the park) with my solo without arousing attention. I think it's probably best to just vape around less people. I'd be worried about the solo dropping out of a drink cup.
Cannabis actually smells pretty strong out of a vape if you aren't the one vaping. I can't smell any of the smell really whatsoever when I vape, but I know others can. Think about how strong that bag or jar of dank you have in the closet smells, and think about how much more strong it will smell if you rapidly evaporate and forcibly exhale all of the terpenes in a load and fill the surrounding air with them.
I think others are digging gas powered portables. I'm thinking about getting a hammer because it can do both oil and flowers and seems to be on demand, and it's not very costly.
I think you are more interested in battery powered so maybe follow PaytonPenn's advice, or stick to a concentrate pen.