Difficult Puzzle! Winner Posts New One!!!

An old man had 3 sons and he wanted to leave his fortune to only one of them but was not sure to whom. He told this to his sons and gave each 3 gold coins and instructed them to buy something to fill a 24x10 room. The first son bought straw but it was not enough to fill the room. The second son bought sand but it was not enough to fill the room. The last son bought two things and was awarded his father's fortune.

What did the third son buy?
 

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