Materials                               Equipment 
balloon                                    scissors 
milk carton                             sticky  tape
plastic milk carton lids        hole puncher
straws


step 1.
Cut the milk bottle in half long ways.
step 2.
use the hole puncher and hole punch the sides.
step 3.
Wither the straw through the holes on each end.
step.4
Poke a small hole through the middle of the milk lids.
step.5
Put the milk bottle lids through the straws so you have wheels.
step.6
Then stick a straw through your balloon and sticky tape it.
step.7
Sticky tape the balloon so it faces the back of your balloon cart.
step.8
Blow up your balloon and watch it go.