When it comes to experimentation, different business models face unique challenges that require thinking beyond the simple randomized control trial to inform decisions critical to the success of companies. At Stitch Fix, we are no exception. Inventory constraints create an undesirable link between observations under different experimental variations. To deal with this, we use the virtual warehouse to split the inventory virtually across variants of an experiment. Furthermore, virtual warehouses also make it easy for us to test different inventory management strategies empirically.