Most of our traveling during the year is done by car. We rarely take both kids with us on an airplane as toddlers require too much stuff. However, long car rides to the beach or the mountains can end up being a nightmare. We try to plan the trips around nap time, but it never fails that they don't sleep. Instead they are trying to have me entertain them from the front seat. I recently stumbled upon some great travel trays! Taby Trays are great for the car seat and great for the stroller too (I have not used it with the stroller).

They are large enough for my children to color on, have their snack on, and best of all, they have a cup holder built it! I used it this summer for the first time on our way to the beach. My kids absolutely loved it! It stayed level and didn't move around. It has a place to put your crayons or markers and your sippy cup. It is super easy to clean! You can order these trays for around $20 each, or you can check out http://www.tabytray.com/ and they offer multiple tray discounts. I think that this tray is going to be a huge asset for our many road trips!
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