Amazon Prime, which costs $79 per year, gives unlimited, free two-day shipping, discounted one-day shipping and free access to hundreds of thousands of TV episodes and movies via Amazon Prime Instant Video.
The Sunday service will expand in 2014 to Dallas, Houston, New Orleans and Phoenix and other major metros, adds the company.
"If you're an Amazon Prime member, you can order a backpack for your child on Friday and be packing it for them Sunday night," said Dave Clark, Amazon's vice president of worldwide operations and customer service. "We're excited that now every day is an Amazon delivery day and we know our Prime members, who voraciously shop on Amazon, will love the additional convenience they will experience as part of this new service."
If it is available in your region, you don't need to do anything but order.