Manga archives (ZIP/CBZ) are a popular format for offline reading and personal backups, but most widely circulated ZIPs contain unauthorized scans and carry legal and security risks. Prefer licensed sources and follow safe-handling practices when working with archives you are legally allowed to use.
If you have a manga volume in a .zip format, you can simply rename the file extension to .cbz, and most manga reader apps will recognize it instantly. The Best Software for Reading Manga Zip Files manga zip files best