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What Filmo said. A cover likely isn't going to protect an ereader from twisting (which is the real killer IMHO) when packed in a backpack. You need something that is rigid. If you can twist the case (without the reader in it of course!!), it's not going to protect it for your purposes. A cover will basically protect it from direct screen impacts and maybe give a little bit of shock absorption if you drop it. Having said that, I've never used a cover and even though I've managed to drop devices (in one case it deformed the plastic on the corner) and I've never broke one. BUT I have a wooden case that it travels in when it's going into my luggage for travel to keep it safe.
Ereaders are a different beast to tablets and phones which have solid and thick glass screens that are a lot tough to break or twist. You need to treat them a lot more carefully when transporting them.
And as to how to know your screen is broken, if you look at the right side you'll see the curved line down it. That's the break point. The other lines are artifacts of the broken screen trying to refresh.
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