Bought a three-pack of these made in the USA garden beds.  They are attractive and measure 4' by 4'.  Very easy to put together - about 1 minute.  Sides are about 9" high.  Only drawback is the sides are not sturdy enough to sit or lean on -- they only hold the soil together.  The cost is a little high for what you actually get; however, they won't rot or get infested with insects.