Perhaps the most common example of unpacking is the separation of nasal vowels into vowel plus nasal consonant when borrowed into languages which don't have nasal vowels. This can be seen in English borrowings of French and Portuguese words, such as monsoon [m?n'su:n] from Portuguese monção [mõs], but occurs widely, as in Lingala [balansi] from French [bals] "balance". Here the nasality of the vowel is separated out as a nasal consonant. If this did not happen, the nasality would be lost.
Unpacking occurs not just in borrowings, but within a language over time. Sanskrit syllabic ? [r?] has become  in Hindi, which has no syllabic consonants; the rhoticity is maintained by the [?], while the syllabic feature is separated out as a vowel.[better example needed]