Olympians may scoff, but for any backyard BBQ or picnic, this volleyball set will do the job. What needs to be official size is. The ball is durable, cleans easily, and can take a good whack on the sidewalk.
What surprised me was the overall quality for the cost. I expect it to last many years. Mine needs to, being donated to a children's group.
A handy feature is the portability of it. Once out of the box, it can be packed and tossed into the back seat of the car and carried to the beach. It assembles quickly, and disassembles just as quickly.
I fully recommend the Easton Platinum Volleyball Set.