@Robinowitz
Hey girl. Haven't been on ECF for months, but stumbled across this while passing some boredom hours on it a couple of times this last week or so.
I have experience with this "style" of bottle from Sigelei. Mine are 5ml capacity, but maybe their dimensions will help in guessing the size/length of the 3ml version. The 5ml bottles are 16mm dia, 45ml long to top of SS cap... 33mm long to bottom of cap. Mathematically that suggests the 3ml bottles are a smaller diameter to have the same overall appearance as the 5ml version.
http://store.sigelei.com/Fuchai-Squonk-Bottle?search=5ml bottle
As for shipping, their website doesn't tell the whole story. I ordered 2 spare 5ml for $9 each ($18) with $7.69 shipping (7-25 days), but received the order seven days later... and they sent me 4 bottles. They came in individual boxes bundled 2 together for the $9. So each bottle shipped was about $6.42.
They are not the super soft bottles, but are soft. The 2 I have been using for many months have held up well, so the spares bought will probably never get used (like the 50+ I had for the Reos long ago when I used them).
When I see your handle I often remember the days staying in a cabin right on the Rogue River (between you and Jenner) in the 60's with my girlfriend (now ex wife) and so much liking the area when we wanted to escape San Francisco. We'd drive PCH up to a ways below Anchor Bay, use a steel cable to get down the 80' high cliffs to the rocks during the only few times a year they were exposed during the lowest tides of the year to collect huge Red Abalone and huge Purple Urchins. The stay at the bottom was short at a very dangerous place, but it was table fare that just couldn't get any better for the days spent in the Littler's cabin.
Anyway, HTH on the bottles and doing business direct with Sigelei. I only vape regulated squonk 20700 and 21700 battery and mech dual 18650 battery squonk mods now days, but my passions are all gone... for forums, for vaping, for life, so I will log back off.