Some say, "Leave the backpacks to the kids. You ain't eight no more." Well, we say, "To hell with your attache case! Youth culture forever!"
Imaginary conversations aside though, the backpack's something we grew up with...and something we're not willing to part with anytime soon for three reasons:
1) Its form makes it easy to cram just about anything into it.
2) It's the most unobtrusive form of bags. It politely stays behind you, and it doesn't have a strap that's trying to strangle you like sling bags' do.
3) The debate of whether to one-strap or two-strap remains a lively argument: