Big Bang Theory Soft Kitty with Ears Backpack Carry all of your school supplies and be the coolest kid on campus when you wear around this The Big Bang Theory Soft Kitty with Ears Backpack! This awesome backpack features an adorable gray design made to look like the soft kitty from The Big Bang Theory show, and even has cute little kitty ears sticking out of the top. Show everyone around that you're a fan of The Big Bang Theory show!