Certain aspects of the present disclosure provide for modular containers with specialized corner fittings. In one example, a container, includes: six sides; and eight corner fittings, wherein each respective corner fitting of the eight corner fittings comprises: a first outward face on a first side of the six sides; a second outward face on a second side of the six sides; a third outward face on a third side of the six sides; and a corner fitting aperture in at least one of the first outward face, second outward face, or third outward face and centered approximately 3.379 inches from a first edge of the respective corner fitting and approximately 3.379 inches from a second edge of the respective corner fitting.