I'm guessing, but it may have a Russian/Kayfun deck & hold something just under 9.9mls of
juice.
Germany I believe has a 10ml limit on tanks, simply because they told the TPD just where it might stick their 2ml limit.
The Germans can be so sensible at times.
Anything over 3.5 mls can have wicking issues at times, varying from lack of flavor to flooding.
But Vapor Giant have been around for while, & may have this covered to.
Finding something this looks good on may be problematical, but I think Vapor Giant may have you covered in that respect.