I made a bag to attach to the back of a bikke rear child seat. I used it to store things like covers, and it was very convenient. It doesn't fit the genuine child seat room. I used a bikke GRI (which has been discontinued). The child seat used for the photos is 5 and a half years old, so it shows its age... I erased the wiring and such that appeared in the photos with eraser magic, so the background is a bit blurry in places. I don't know if it can be attached to child seats other than the bikke series. The material is not a see-through, flimsy fabric, but a moderately thick one. There is no lining. It's made of water-repellent fabric, but the effect will gradually wear off. It is not waterproof, so it cannot completely prevent water. If left wet, it may become discolored or moldy. It was made to fit when the headrest is in the highest position. It can be used in other positions, but the upper Velcro belt will be on the child's side. Please refrain from purchasing if you are concerned. From the highest position to the second lowest position, insert the lower back belt as shown in image 12, pass it through the seat surface, and secure it by bringing it out the back. In the lowest position, you need to insert the lower back belt into the gap as shown in image 15. You may need to take your time and be persistent (this is what I do), or you may need to use a tool. 23 x 32.8 cm Bottom: 5 x 27 cm Please forgive any errors. There are fold marks. There are white pen marks, but they can be removed by hand washing. It will be folded small and shipped via Yu-Packet Post Mini. The colors may be different. Please refrain from price negotiations.