Luke, I did everything you said in your first post. Repacking FML as modpack.jar and placing it into the bin folder. Placing the mods into the mods folder and configs into the configs folder. Packing everything as a .zip with compression method "best". Uploaded it to my own server, not dropbox or something and pasted the link into the settings of my modpack but as soon as I'm trying to download it with the Technic Launcher it says "error unpacking zip file".
Do you know why?
*EDIT*
It seems like it stops at the modpack.jar. Do I have to include only FML or the minecraft.jar too?