Use this reservoir to carry around extra ink so you can refill your pens when you're away from your studio. This reservoir holds two pen refills, which is 8 ml or one quarter ounce of ink or paint.
Two caps secure both ends from leaking. To fill the reservoir, take off the top cap from the portable reservoir and fill the reservoir with ink or paint. Leave a bit of airspace at the top to prevent burping when you replace the cap. Replace the cap to secure against leakage.
This reservoir has a size and shape that approximates our pens, so the reservoir will fit into our pen box for convenience.