This is not your typical Sandtrooper backpack... this puppy was literally wired for sound. Visible in this illustration (photo) is a side-mounted speaker (near center of pic - it's a stereo pair). A portable CD player was installed in one of the compartments. I can march Imperially while blasting away with our Imperial March theme echoing through the halls of the Deathstar, or wherever the heck I am. It's quite an attention getter.
Photo by TK861