UberRush currently operates like a traditional bike messenger courier service — the firm does not yet purchase goods for users on-demand — but recent partnerships with firms like cosmetics startup Birchbox, clothing rental service Rent The Runway, and product design community Quirky reveal Uber’s intentions to expand into product delivery.

http://venturebeat.com/2014/07/01/uber-cuts-courier-prices-expands-now-handles-thousands-of-deliveries-per-week/