Force needed to damage Mac internals

Hey guys,

I'm in the process of designing a range of heavy duty laptop sleeves and bags. I'm struggling to find in depth details about the sort of force that MacBooks/Pros/Airs need to incur before the HD will get scratched and other internals damaged. I know they can take a mighty beating on the outside, i've got friends which have huge dents externally and all is well inside, but i'm looking to offer enough protection to keep everything safe.

If anyone has any knowledge on the subject it would be amazing!

And if anyone is interested and fancies keeping up to date about progress with bags... http://www.BIFFme.co.uk Full website and prototypes coming real soon.

All the best,

BIFF