What is NOT a characteristic of a flat?

A flat is typically defined as a shape or item that possesses specific characteristics. One of its primary features is uniform thickness, meaning that it does not change in depth or width across its surface. This allows it to maintain a consistent form, which is useful in shipping and packaging scenarios.

Additionally, a flat is generally rectangular in shape, providing a stable and easily stackable geometry that lends itself well to efficient transportation and storage. The rectangular shape facilitates easy handling and organization, as flat items can be neatly arranged.

Characteristics such as rigidity or flexibility relate to the material properties rather than the definition of a flat itself. Flats can often be made from materials that are either rigid or flexible depending on their intended use, but the defining characteristics of a flat do not include the term "rigid." Thus, the notion of flexibility versus rigidity does not apply directly to the concept of a flat, which is primarily defined by its uniform thickness and rectangular shape.