On MTS the preferred format is .package files. We do not accept uploads with .sims3packs except in those areas where it is absolutely necessary (worlds and lots).
Converting to Package: If your item is created in .sims3pack format, it is very easy to convert to a .package file. Just use Delphy's Multi-Sims3pack Extractor utility to get the .package file(s) out of your .sims3pack.
Please do not also include a .sims3pack version of your files attached to your upload here at MTS. You may, however, upload .sims3pack versions elsewhere and link to them in your upload... i.e. "If you would like a sims3pack version of this item, you can get it here: (link)" - this is not meant to advertise your creations elsewhere, just allow those who may want a sims3pack version to get it.
