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 ($18) that has a big front pocket and padded shoulder straps. Or show total Batman love with a colorful backpack ($39, originally $75) that is covered with superheroes. She can show she's ready to take on anything with a classic Wonder Woman backpack ($30) that even includes a cape. Get in on the Angry Little Girls fun with this superhero backpack ($28, originally $36) that has tons of room for all those books.