Glass ink holders are the best way to store inks, especially iron gall blends. These screw top glass holders are water tight, and hold .16 oz (5 ml) of ink or gouache, and 4 are included.  They are the perfect size to dip calligraphy pens or small paint brushes. 
The Zebrawood holder is hand-cut, sanded, and coated with a satin varnish. Zebrawood is grown in West Africa and is light brown to straw color with dark blackis brown stripes, resembling zebra stripes.
The piece measures 6" x 2' x 1" high.