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 they are included.  They are the perfect size to dip calligraphy pens or small paint brushes. 
The Blue Mahoe holder is hand-cut, sanded, and coated with a satin varnish. Blue Mahoe is grown throughout the Caribbean, and it is usually grayish or olive brown with streaks of green, blue, or purple with a pale yellow heartwood.
The piece measures 6" x 2' x 1" high.