"Half height containers" typically refer to shipping containers that are half the height of standard containers. Standard shipping containers come in various sizes, with the most common being the 20-foot and 40-foot containers. Half height containers are designed for the transportation of goods that are bulky but not necessarily tall.

These containers are especially useful for items such as coal, gravel, or other heavy materials that can be loaded and unloaded more easily when the container has a lower profile. They often have a top-opening mechanism for easy loading and unloading of materials. The reduced height makes it more practical to access the contents from the top.

It's worth noting that while half height containers serve specific purposes, they are not as common as standard containers. The choice of container type depends on the nature of the goods being transported and the requirements of the shipping or logistics process.