Along with holding all the back-to-school essentials, these backpacks are all about being ready at a moment's notice. Save the world with an Avengers backpack ($30) that has a big front pocket and padded shoulder straps. Or show total Marvel love with a colorful backpack ($50-$85) that is covered with superheroes. She can show she's ready to take on anything with a classic Wonder Woman backpack ($60) that even includes a cape. Get in on the Angry Little Girls fun with this superhero backpack ($36) that has tons of room for all those books.