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Piled up, they fill
and weigh 128 lb (58 kg)
about 3 times the size of a wheelbarrow load
Sizes and weights are typical for an adult or standard tennis ball; real ones vary.
1,000 tennis balls make a substantial pile that is about 3 times the size of a wheelbarrow load. When you stand next to the heap, it reaches 16.3 in (41.3 cm) tall and 5.09 ft (1.55 m) wide.