packed / pact are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
packed: (verb) arrange in a container. (verb) fill to capacity. (verb) compress into a wad. (verb) carry, as on one's back. (verb) set up a committee or legislative body with one's own supporters so as to influence the outcome. (verb) seal with packing. (verb) load with a pack. (verb) treat the body or any part of it by wrapping it, as with blankets or sheets, and applying compresses to it, or stuffing it to provide cover, containment, or therapy, or to absorb blood. (adjective) pressed together or compressed.
pact: NA
packed: p·AE·k·t
pact: p·AE·k·t
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)