I like traveling with my Pico. It’s cheap @$20 and if it gets left behind or broken, I didn’t break the bank.
Here's a quick size comparison.
The blue tape stuck to the Mirage shows the height of the Jac Vapour Series B. There's only 5mm difference in size between them although the Mirage holds a bigger 21700 battery.
The Pico is what I typically carry away from home unless I'm using an ultra portable device like the Breeze or a pod like the Myblu. The Pico is 70.8mm tall but part of that height is only the cap for the battery on 1 side so your atomizer sits even lower.
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I alternate but about 90% of the time, it's either JACs or Xvos, both of which I carry comfortably. If I'm out of the house, my mod is never the biggest nor heaviest thing I'm carrying, so I'm fairly flexible.
The only others that ever make the cut are the BME, Provi Ti, or Goby. It all depends on my mood, and I rarely know which until just before I grab for it.
None have ever gotten smashed up in my pocket like old Marlboro Medium sometimes would.

I do love this stuff so.