A portable would have to have a fan or pump, just like any bag filler. That requirement alone eliminates 'portable plus bag fill', since current battery technology won't support that kind of power drain. You could provide a really large battery, but the cost would increase a lot. Big bulky battery plus bag just doesn't make sense for a portable. Financially, the market for this kind of setup just isn't there. Portables are designed for convenience.
i know vapir i believe makes one
The Vapir One is often called a portable, due to the small size, but it isn't. It's an AC model just like any other bag filler.