The present invention relates to a receiving spacer layer for a mobile electronic device and a bag combined with the receiving spaced layer. The receiving spacer layer includes a protection pad which is made of a soft foam material and has a first accommodation space to receive a first electronic device, and a bag fabric is connected to the first accommodation space to receive the first electronic device. The receiving spacer layer is combined with the inside of the bag. The bag has a second accommodation space to receive a second electronic device, such as a notebook computer. The first and accommodation spaces are able to accommodate two mobile electronic devices. The present invention is convenient for use and can be carried with ease.