Just a stray thought here.

Have you considered a ladies cosmetic compact make up mirror. You know the type that comes in a small case with face powder and a dust patch. You can even get them with magnification, usually 2x or 4x.

I have seen them sold in empty cases, no powder or pad, and I suspect if they can stand up to being in a purse they might survive being in a kit.

Here is an example in stainless steel with both 1x and 2x.
http://www.dhgate.com/3-pcs-sample-cosme...25241d00bf.html
Absolutely no idea of how good the quality is.