TWSBI Vac Mini Fountain Pen - Smoke/ClearA surprisingly capable little vac filler The TWSBI Vac Mini takes the full vacuum filling system from the Vac 700R and shrinks it into something much easier to carry every day. The smoke transparent body keeps the demonstrator feel, but tones it down with a darker, more understated look. Despite the smaller size, it still manages impressive ink capacity, a shut off valve for travel, and even a threaded posting system so the cap locks securely onto the