A portable device case can be engage various removably attachable accessories. The case is sized and shaped to at least partially enclose the mobile device and includes an opening sized and shaped to receive at least a portion of a casing of an accessory, a top flange sized and shaped to removably engage with a top flange of the casing of the accessory, and a bottom flange sized and shaped to removably engage with a bottom flange of the casing of the accessory. Various accessories and removable attachments can be used with the case.