For ePacket Light (Economy Airmail - SAL with tracking information), It is only available for a limited number of countries and territories. 

Country/ Area
Asia Bhutan, Cambodia, China, Hong Kong, India, Indonesia, Macao, Malaysia, Philippines, Rep. of Korea, Singapore, Thailand, Vietnam, Guam, Saipan, Midway, Northern Mariana Islands, Wake
Oceania Australia, New Zealand, America Samoa
North/ Central America Canada, Mexico, U.S.A. & overseas territories (Puerto Rico, Virgin Islands)
Middle East Israel, Turkey
Europe Austria, Belgium, Denmark, Finland, France, Germany,
Great Britain, Greece, Hungary, Ireland, Italy, Netherlands,
Norway, Poland, Russia, Spain, Sweden, Switzerland
South America, Africa Brazil
 * data from Japan Post