Americans' spending on back-to-school items for kids in grades K-12 and college students is projected to reach $82.8 billion this year, down from last year's estimated spending of $83.6 billion, according to new survey results published by the National Retail Federation. Families with children in elementary through high school plan to spend an average $684.79 each, according to the survey, while college students and their families plan to spend an average of $942.17 each. Buyers plan to spend the most on clothing, followed by electronics, shoes and other supplies such as backpacks and lunchboxes.