This travel-size, 20ml capacity ink bottle is meant to be used with the vacuum-filling TWSBI (commonly pronounced "twiz-bee") Vac700R, and Vac Mini fountain pens. However, it can also be used as a travel inkwell for all other types of fountain pens.
The three-part cap provides a snug fit for the vacuum-filling TWSBI pens. The upper cap is compatible with the TWSBI Vac Mini. The Middle cap works with the TWSBI Vac700R. The lower cap is for all other types of fountain pens.
TWSBI Vac 20 Ink Bottle Specifications
Type: Travel Ink well / Ink Bottle
Ink Capacity: 20ml
Three-part cap is compatible to fit the vacuum-filling TWSBI Vac Mini, TWSBI Vac700R. The lower cap can be used with all other fountain pens.