An accessory unit, comprising: a front flap comprising: a plurality of segments, an inner layer and an outer layer disposed on either side of the plurality of segments that allow the front flap to fold in regions between the plurality of segments, and an end region; and a rear cover coupled to the front flap, the rear cover comprising: a shell forming a recessed portion, wherein the inner layer and the outer layer bonded on either side of the shell, a chamfered opening in the shell, a rigid filler disposed within the chamfered opening and in contact with the inner layer and the outer layer, and a lip mechanically coupled along a periphery of the shell, wherein the lip is formed from a material more rigid than the shell and is configured to retain an electronic device within the recessed portion of the shell; wherein the end region of the front flap hingedly couples the front flap to the rear cover and the front flap is configurable between a closed configuration in which the front flap at least partially covers the opening to the recessed portion and an open configuration in which the opening to the recessed portion is at least partially uncovered, wherein the rigid filler is configured to transfer a force exerted on the outer layer to a button disposed on the electronic device. a front flap comprising: a plurality of segments, an inner layer and an outer layer disposed on either side of the plurality of segments that allow the front flap to fold in regions between the plurality of segments, and an end region; and a plurality of segments, an inner layer and an outer layer disposed on either side of the plurality of segments that allow the front flap to fold in regions between the plurality of segments, and an end region; and a rear cover coupled to the front flap, the rear cover comprising: a shell forming a recessed portion, wherein the inner layer and the outer layer bonded on either side of the shell, a chamfered opening in the shell, a rigid filler disposed within the chamfered opening and in contact with the inner layer and the outer layer, and a lip mechanically coupled along a periphery of the shell, wherein the lip is formed from a material more rigid than the shell and is configured to retain an electronic device within the recessed portion of the shell; a shell forming a recessed portion, wherein the inner layer and the outer layer bonded on either side of the shell, a chamfered opening in the shell, a rigid filler disposed within the chamfered opening and in contact with the inner layer and the outer layer, and a lip mechanically coupled along a periphery of the shell, wherein the lip is formed from a material more rigid than the shell and is configured to retain an electronic device within the recessed portion of the shell; wherein the end region of the front flap hingedly couples the front flap to the rear cover and the front flap is configurable between a closed configuration in which the front flap at least partially covers the opening to the recessed portion and an open configuration in which the opening to the recessed portion is at least partially uncovered, wherein the rigid filler is configured to transfer a force exerted on the outer layer to a button disposed on the electronic device.