Hard Plastic Foam-lined Protective Carry Case.

The inner diameter is 9  3/4 inches by 13 3/8 inches by 4 inches. The outer diameter is 14 x 12 1/2 x 5 inches and they weigh about two and a half pounds each. The egg carton patterned foam inside the lid is attached. The foam tray in the other half of the case lifts out as you can see in the photos.

I traded a technician a number of years back for a bunch of these. I've used them for all kinds of things. There are two sliding locks you can see detail in the last photo.