If I have a large set of small files it takes Windows a long time to copy them (say five minutes) due to the overhead per file. If I wrap them up in a container it transfers them much faster (say three minutes).
Currently I use UltraISO. But after adding many files to the ISO it becomes too slow creating the ISO file itself.
I don't want to use Zip because the overhead of zipping is slower than just transferring the files separately.
How else can I store many files in one file without using any compression?
tar
utility is what you are looking for. Originally from Unix, GNU has pre-compiled binaries available for Windows. It archives files together in one big file, with optional compression, using zip, gzip, bzip, 7-zip, etc.