If you are so careful with your device, then you must use one hard shell cover (like that you see on amazon site). I ordered the same one for my 4 days old GloHD.
My Aura 6'' is 16 months old and I always carry it around with me in my bag. I use the same cover. The reader is in excellent condition (after all the stress it had: Cold and hot conditions under the sun - with the case, of course!-. )
The same with my H2O. Is almost 11 months old. I have it for home reading. The case save the device from several
FALL asleep...

The newest Glo HD is laying on a self and waiting his case. I won't go outside my door with a naked device... I will bring a disaster for sure!