Made from 80% polyurethane 20% polyester is the powerful Ghost Busters Proton Pack Backpack! We think Egon made this slightly less dangerous version of their trademark weapon as a way to get the common folk a way to enjoy an unlicensed nuclear accelerator strapped onto their back. The Ghost Busters Proton Pack Backpack 19 inches high by 12 inches wide; slightly larger than your average backpack and technically having 3 areas for stuff and/or ghost storage! The technical part is that 'gun' of this Proton Pack - attached via buttons and measuring 14 inches long by 5 inches high! This kind of organization will prevent mass hysteria transmitted by dogs and cats living together!