Uber has allowed users in cities around the world to quickly hail a ride. Now the company is expanding that same idea to delivery to bring users virtually anything to their doors with its burgeoning mobile delivery service UberRush.

After last year's test launch of UberRush in New York, the mobile delivery service officially launched in Chicago and San Francisco Wednesday. UberRush partners with local businesses in each city to bring goods directly to consumers' doors, from burritos to fashion.

Similar to how anyone can opt in to try and become an Uber driver, UberRush enlists the help of couriers across the city to help make deliveries happen on foot, by bike or by car. When someone places an order through UberRush, the app connects the business to the courier, or what UberRush is calling a delivery partner, who then picks up the delivery and transports it to the customer. Uber will collect a fee of $5 to $7 per delivery, which the businesses can decide to pay or pass onto the customer, according to The Wall Street Journal's Digits blog.

UberRush has also partnered with online retail platforms, such as Shopify, Clover and Delivery.com, to help facilitate getting UberRush added as a delivery option on the online order forms for more businesses in the future.