While at the airport over the weekend, I saw a mom with a set of twins who had these REALLY cute monogrammed backpacks.
They are perfect for your toddler to put all of their favorite toys, books and colouring materials in for a trip. The pack itself is small enough for your child to carry on their back, but big enough for them to store enough stuff to keep them busy for a few hours while in the car or on an airplane.
With a cotton twill exterior, polyester padding and nylon-lined interior, these ARE machine washable. They gather at the top with grommets and drawstring. Because of the drawstring, the manufacturer does not recommend these for children 4 and under. The flap secures with a magnetic snap. There is a small exterior zippered pocket on each style. The backpack straps are adjustable. There is a handle at the top for carrying in your hand. These are sized for younger children with dimensions approximately 11.5″ tall x 9.5″ wide x 4″ deep.
palmgifts.com for $32. You can choose from 6 different fonts and 11 different backpack styles.