HiPac (stylized as HIPAC) (pronounced as high-pack), is an audio tape cartridge format, introduced in August 1971 on the Japanese consumer market by Pioneer and discontinued in 1973 due to lack of demand. In 1972 it only achieved a market share of 3% in equipping new cars. In the mid 1970s, the format was repurposed as a children's educational toy called ポンキー (Ponkey) and was used in the analog tape delay "Melos Echo Chamber".