Interesting idea. The tray has sides so that little toys or crayons won't roll off. Attaches to car or can be worn as a backpack.
Pyssel: Djur av äggkartong
Paper Snowman Craft - easy little snowman made of paper strips. It would be fun craft to do with kids for winter!
Monster Mix Up Play Set Quiet Book with clip by CurlyTailCrafts
35 Science Experiments That Are Basically Magic
Gift Bow Tutorial: Hand Stitched Felt Bow - Crafts Unleashed
Gone Camping Craft
Fireworks painting activity - great new year's or other celebrations activity.
Scissor skills / Straight lines / Mr Octopus
Sew up a DIY Travel Pillow to make the whole trip go a lot smoother.