Hi, I have some questions, just bought my first tablet the Asus TF300. Questions: 1. On amazon, some screen protectors say "Lifetime Replacement Warranty", what does this mean? Does this mean if I mess up applying a screen protector and peel it off, they will send me another one for free? 2. I am looking for a hard case for my tablet. I am going to be putting in my backpack with heavy textbooks and other stuff and don't want it to get squished. Will those stand cases protect it? I looked for really hard cases but can't find any. Are there like any super hard shell-like cases so I don't have to worry about my tablet getting crushed in my backpack? Thanks.