For a laptop, the inside of a backpack presents a jarring environment filled with shifts, bounces and the occasional bump. That's why Apple engineers designed the iBook G4 from inside out to stand up to the rigors of a strenuous life on the go. After all, you shouldn't have to walk softly just because you're carrying the world's most appealing notebook.Made of ultra tough polycarbonate plastic - the same high-grade material used in bulletproof glass - the iBook's sleek white case resists impact. While that measure alone might have allowed iBook to comfortably survive everyday use and abuse, Apple engineers took the idea of protecting your investment quite seriously. Inside, a sturdy magnesium frame provides superior strength, while reducing the weight of the iBook G4 to well below that of other full-featured PC notebooks. Rubber mounted for added bump tolerance, the iBook's hard disk drive lets you store all of your digital goodies and still enjoy peace of mind.