here instill this zip-tool
then you can high-lite all of them right click-on them then zip them all together. then rename the file to the map name you like to use.
Link:
http://zipgenius.altervista.org/dlc/zipgenius/index.htm
i would get the suit you get all type of tools to use upload FTP and down them. come in handy with a zip-cutter to make really big files smaller to upload them to a site. you can even cut them up into GB in-size too to burn a DVD off with. basic the zip-cutter is a splitter that cutup a file size into smaller zip-packs.