This model was created for the RoadReady: Car Accessories event / competition. I knew that people struggled with bag managment in the cramped spaces of cars, which is why I created this. For how the model works there are 4 objects, the headrest hooks (10mm and 12mm to fit every car), the hanger to carry the bags, and a phone backrest (long stick with 2 pegs). This hanger can also be used as a phone holder, although it only works with 2 on the same headrest (to balance the headrest). For correct use, find out whether your headrest is greater or less than 11.5mm (greater than use 12mm hook, less than use 10mm hook), then simply put your bags on the hooks! SAFETY INFO: If the hooks do not snap on tightly to the headrest poles, DO NOT USE THIS PRODUCT. Use a more heat resisent filament like PETG or ASA otherwise it will soften in the car during hot temps (especially PLA, I recommend not using it). If anything shows any signs of bending or breaking, IMMEDIATLY STOP USING. Thank You.