I have a sketchbook in my pocket (Value ~ $3). If I were to drop it out the window from the top of my house it would be ok.
I also have an ipad (Value ~$400). Dropping that out of my backpack from about 2 feet off the ground means needing a new one.
I went through a few hours yesterday convincing myself that I could live without it, then I bit the bullet and purchased a refurb. Stupid technology.