Splitting large zip archives

[R Kimber]

I need to be able to slpit large zip archives (e.g. 9GB) into smaller zip
archives (<4GB) so that individual files are not split across the
smaller archives.

zipsplit seems to do exactly what I want, except that it says that it is
limited to archives of 2GB in size.

Does anyone know of a suitable tool that would do this? Or must I
extract each large archive and recreate the smaller ones manually?

- Richard.
-- 
Richard Kimber