I had a similar need. My solution was to install portable Strawberry Perl on a USB drive, install CPAN::Mini into it, and run the following from the Strawberry portableshell command line: 
minicpan -p -l \CPANmini -r http://some.cpan.mirror/pub/CPAN/

[download]
The USB drive has top-level directories /strawberry and /CPANmini - together they currently fit on a 4GB USB drive.

In reply to Re: Minicpan size issue by keszler
in thread Minicpan size issue by gurpreetsingh13

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