Boombox Backpack – Reppo ii
Created by industrial design student Joonas Saaranen, the Reppo II backpack features a built in pair of full-range speakers and an amplifier, so you can kick out your music as you walk.

Saaranen’s concept design has gotten as far as a functional prototype at this point, but he hasn’t revealed if he’ll ever have them produced en masse. In the mean time, if you happen to be in Berlin, Germany (where Joonas currently resides) and hear someone coming down the street wearing this bad boy, offer up the mad props he deserves.

It has been done before and mass produced. They actually sold em in a skateboarding magazine, CSS. But this backpack looks a lot cooler.