The word "Oopack" is spelled as /uːpæk/. The IPA phonetic transcription explains that the first sound is a long "oo" sound, as in "food." The second sound is the "p" sound, followed by an "a" sound as in "cat." The final sound is a "k" sound. This word does not have a clearly defined meaning in the English language, and its spelling may be unfamiliar to some. However, understanding IPA can help to decipher the pronunciation of unusual words.