Are packrat bundles really portable across different platforms?

I have a packrat bundle built on a MacOSX box.
Is this bundle portable across different platforms? Windows, for example.
I am organising a course where each student will use his own machine.
I thought that would be good to use packrat to build and deploy the environment and make sure that it is unique.

In packrat home page I've found that it is portable, but I'd like to know if someone else had any previous experience deploy packrat bundles across different platforms.
I should also mention that I plan to use packages that have native libraries dependencies, like dplyr, for example.

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