I got interested in stealth because of new restrictions at work. I've only been playing with this for a few days but so far so good. It's silly small, 3 1/8" tall, hard to appreciate from the photos.
The juice bottle is 18 ml.
It's dwarfed by my Pico. Hiding in a watch pocket.
Evic Basic set at 400 degrees and 30 max watts.
Nipple rda clone barrel and drip tip mounted on a Stumpy rda clone deck with replacement o-rings to perfect the fit. The Nipple deck has virtually no juice well so that deck was swapped out for the Stumpy deck. The Nipple barrel can be configured with one air supply which I prefer. It's flat sides are tall enough to accommodate a tall slip ring for controlling leaking for pocket carry. The slip ring can be pushed down to expose the air supply. The Nipple drip tip is harder to drip through but it's ultra short so it stays.
Build is 28 gauge single stainless coil at 1.43 ohms, single air supply from the Nipple barrel, 22x12 mm silicone slip ring, .035" x 22 mm 510 shim to make a tight fit between the decks of the rda and the mod. (The rda has an unusually long center pin.)
My stealth e liquid is a DIY mix with 9 mg nic, 1% flavoring, and 100% PG. If you hold on to it for a second or two there no visible vapor exhaling. Minimal flavoring means less odor. It is inferior to my usual 60% VG mix but this is a stealth project.
The rig is 3 1/8" tall, small enough to be concealed in one hand, as long as it's held close the body. It's also small enough to be totally concealed in my blue jeans watch pocket where it's unlikely to turn upside down and spill liquid from the drip tip. My phone needs to switch to the left pocket but there's room below the watch pocket for a Pico or VTC mini and a bottle of juice.
The Basic is rated for 1500 mah and has a puff timer. I also have a VTC mini with a 3000 mah LG HG2 with a puff timer. (Both have similar boards.) I got 430 seconds on the first try with the Basic. From the aforementioned VTC mini 1,000 seconds is not unusul.
Update
I decided I wanted a belt pouch for this and got lucky. I have a cheap monocular that came in a belt pouch that's about perfect.