You will want to find a version of Stuffit w/Dropstuff. I know v6 will create a regular .sit. When you have dropstuff, you can simply drag and drop folders to make an archive.
That said, I personally prefer .tar.gz as it is universally accepted across the Mac OS, Mac OS X, and Linux/BSD world. (I'm not sure if versions of stuffit before 4 can untar/unzip them, so you will want to check ahead of time if you are archiving for very
early versions of stuffit.)
Just an FYI:
Expander 5.0 contained many bugs, and its file format was not readable by the earlier version 4.5, leaving Mac users of the time without a viable compression utility.
68k: Duo 230, 270c, 280c, DuoDock II, DuoDock Plus, Apple Minidock, Newertech Netdock & Ultradock 16sce, 540c, 190
PPC: 2300c, 5300ce, Performa 6500, Wallstreet II 300, B&W Powermac G3 500, iMac G3 700
PRAM? When in doubt, Pull it out!