Kamoya Birdy Porter This is an auxiliary wheel that allows you to roll the Birdy Porter around even when folded. It comes with a water bottle holder and a Kamoya rin-ko bag (travel bag for bicycles). The logo on the rin-ko bag is a bit worn. The rin-ko bag hasn't been used much, but it's in good condition. The Porter has no major damage or deformation. There are small scratches in various places. All are shown in the photos.