Mega Bloks Fill-N-Dump Wagon. Fill"n Dump Wagon Give your preschool builder a building set to go. This pull-along wagon contains 25 brightly colored, heavy-duty plastic pieces. Little "workers" can carry their cargo to the next job site, and begin building structures either on or off the Mega Bloks wagon. Chunky pieces are ideal for small hands. Great for ages 1 and up. Made in Canada. Dimensions: 7.00" L x 6.00" W x 9.20" H; Weight - 5.00 lbs