They can sign up for to work in two-, four- or eight-hour shifts via a mobile app. Couriers can work as much or as little as they want. It's a similar model to Postmates, which also allows couriers to deliver food from restaurants, groceries and even retail items from stores. Even ride sharing giant Uber is intrigued by the courier business, testing deliveries of food.

The differentiating factor, for now, is that Amazon's work force will be delivering packages of goods sold through its own site. And the service will only work for Prime members, who pay a fee to have access to a faster delivery on select items they buy through Amazon's marketplace.

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