Apparently some drug exporters in Malaysia are smuggling their stashes in inkjet cartridges. This week, Hong Kong police nabbed a Malaysian who picked up two packages of "computer printer cartridges" from a courier company. From New Straits Times:
When Hong Kong police opened the packages, they found that the cartridges had the carbon strips removed and replaced with ketamine, also known as "Special K".
Hong Kong police alerted their Malaysian counterparts. Over the next two days, Federal narcotics department officers raided several shoplots and a luxury service apartment.
Two men were arrested and 15 used printer cartridges and an undisclosed amount of ketamine seized.