It seems that i3Play audio player has default export function to MP3 format, so i3pack to mp3 conversion is possible and doable. Used to export the unique .i3pack audio files to common .mp3 audio. As far as we know, there does not seem to be any other way how to manage this conversion.
Convert i3pack audio file to Compressed audio and music file, mp3 songs or ringtones.
We found one software available in the database for this conversion.
Microsoft Windows software - convert i3pack to mp3 on Windows
Audio player and MP3 converter for i3pack audio files
Convert from i3pack file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.