Umbrella Holder for Backseats
thingiverse
This umbrella hook can hold up to two umbrellas on the back of your backseats in the car's trunk. Just make sure there are those tether points in your car (see photos), I think they are standardized - at least in Germany / Europe. Just print two of these and put them on your backseats. You will have a nice place to store your umbrellas!
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