I don't know what you guys are going on about, that's a perfectly normal first-gen Paintball Mania "Featherlite" tank from back in the mid ninties.
Most of the first "Nitro" systems to hit the market used off-the-shelf wrapped tanks, and there were only a few sizes available. The earliest were 68 ci 2,700 psi bottles (Tom Kaye still has one dated '92) or a 114 ci made by Parker. Paintball Mania used a different supplier, and their earliest systems had
flat-bottom tanks, and came in two sizes- 71 ci and 134 ci (!)
I still have my August '95 PMS FW71 (in the pic) and I once had one of the 134s, which was truly huge, ugly and heavy.
The tank shown in the first post is one of PMS' "specials" they called the Featherlite, since they were considerably lighter than the flat-bottom tanks, which were only hoop-wrapped, and not fully wrapped (thus the inner aluminum bottle had to be heavier, since the fiber wasn't adding as much strength.)
The first Feathers were only 2,300 psi tanks, though they upgraded to a full 3K shortly thereafter. I can't recall the size off the bat, but I want to say it was 77 ci or 82 ci. It's not that large- it just looks that way due to the small gun/short barrel and odd cradle combo. A normal AA 114 is about as long, but about 2" bigger in diameter.
Doc.