Eggg dropp! helllllpppp!?

I have to do this egg drop next week...and i really need ideas.....well were dropping it off our high school stadium which is 50 feet...we cant use peanut butter or latex balloons or traditional packing things....ive heard aboout stuffing the egg in a nerf ball, stuffed animal.....i was thinking like putting a slit in a car sponge and then putting bubble wrap around it and then somehow put it in a box or something...im not quite sure yet...ive tried putting cotton balls in a box with the egg in a fuzzy sock with more cotton balls on the top in a box butttttt it didnt workkk.....any otherr ideas??? what about cereal...like rice krispys..ive heard that too! please give me step by step ideas if you can!! thanks! :)