Is your corrugated board single or double wall? November 07, 2020 00:06 Updated Our corrugated boxes are produced with single wall board.You can read about the default thicknesses of our box materials here. Related articles How thick is the material of my boxes and how much will they weigh? Are your boxes made in the USA? Do you use sustainable, recycled materials? Can I ship a mailer box without using any other external packaging? What is Econoflex?