Expand the amount of space you have to store drinks, snacks and other small items in your car by sticking a few suction cup shower caddies to the windows. It's cheap, easy and great whether your passengers are kids or adults on a road trip. Image from Grey House Harbour.
These caddies will give you and your passengers more space to put stuff within arm's reach in addition to cup holders or seatback pockets. If you have kids, this makes it easier for them to get to their toys. For road trips, you can load up the caddies with drinks and snacks to keep your kids happy without you having to stop driving to hand them out.
Caddies made of plastic are best since metal ones could heat up in a hot car. Make sure you get a solid seal on each cup when you install them so they can hold whatever you want without falling off the window and spilling stuff everywhere. Since the caddies are open at the top, definitely don't put anything in that might go flying during a sudden stop.
Road Trip: Kid Prep- Organisation [Grey House Harbour]