Amazon order delivered in four hours?

Yes. (just less than) four hours. I ordered a Klean Kanteen insulated bottle on at 11:20 am Monday morning. I selected one day shipping because I have Amazon Prime. So for $3.99 I get the bottle tomorrow, I thought. At 3pm, which is 3 hours and 40 minutes later, my door bell rings and it is the delivery guy from their delivery service. Bottle delivered. Less than four hours. How is this possible? It is a combination of inventory management system, and they must have a fulfillment center right here in Massachusetts. But even then, someone has to pick up the bottle, boxed it, call the courier service, pick up the box, and delivery down to my loft, all within four hours.

Amazing, Amazon.