Linsh.rar -

Many small, similar files, as it treats them as a single stream to boost compression.

Right-click the folder or files you want to archive. Linsh.rar

7-Zip also supports solid compression using the .7z format. To make sure I'm giving you the best approach, let me know: Are you using Windows (WinRAR) or Linux (terminal) ? Many small, similar files, as it treats them

In the "General" tab, set to RAR (Solid mode only works with RAR, not ZIP). Check the box for "Create solid archive" . To make sure I'm giving you the best

Choose "Add to archive..." from the context menu. Configure Solid Option:

If you provide this info, I can tell you if you should be using the rar command-line tool or if a simple right-click in Windows will do the trick. rar - ArchWiki

Are you trying to create or turn multi-part files (.part1, .part2) into one ?