Most trips to my parents' cottage include bringing cut flowers from our garden. I transport the flowers in an empty plastic gallon milk container that I've cut away to make a bigger opening and still have the handle intact. The broad base of the container, when filled with a couple of inches of water to sustain the flowers, is pretty stable for the car ride. Much easier than trying to transport a tall vase of flowers.
I meant to take a picture of the latest bouquet but forgot. This morning my dad sent a picture he had taken.