IPA: /ˈpriːˌpækt/
KK: /priˈpækt/
Describes something that has been packed beforehand, usually for convenience or to save time.
I bought some prepacked meals for the camping trip.
Prepacked → It is formed from "pre-" (meaning before) and "packed" (from the verb "pack", meaning to fill a container). The word "prepacked" means filled or packaged before it is sold or used.
Think of something that is 'packed' ('pack') 'before' ('pre-') it reaches you — that's what prepacked means.