Mine kicks around in the cash box,
My wife has one in her purse.
I had 50 extras at one time and gave almost all away, now I am down to about 3 extras and smart isn't sending out bunches to there inner square anymore so I will sit on them just in case the one kicking around in the cash box gets to beat up.
If your looking for something more protective and you don;t have spares, check this out
http://www.etsy.com/listing/75007193/square-credit-card-reader-3d-printed