I lol'd a bit with this one.
Actually, if you're familiar with the form factor of the vaporshark dna 200-IMHO very pocketable mod but 3s lipo.
88mm x 48 x 24 @ 170grams (according to pbusardo's video).
The boxer DNA133 or SX350j V2 measures in at
80.5mm x 41.4 x 40 with batteries its still a tad lighter than the VS DNA200
So its just 1.6cm thicker than the VS but shorter & narrower, and with this mod you can fit any atty <=25mm in diameter.
I know I'm sounding kinda biased right now but I really love their mods as I have 3 of them already.
And to add to the sigelei 213 its measurements are
88mm x 44 x 28 @ roughly 150grams without batteries.
[edit] According to Eciggity the Efusion duo measures in at
90mm x 56 x 26
You forgot my favorite Boxer, the Boxer75
Dimensions: 81.5mm(H) x 51.2mm(D) x 29.5mm(W) (3.2″(H) x 2.01″(D) x 1.16″(W) appox.)
Yes, it is very pocketable.