In short, mattress in a box is a new way of buying a mattress that changed the outdated method of mattress purchasing and shipping. It allows you to order a mattress online, and get it packed in a conveniently sized box. Mattress companies simply compress, roll and pack mattress in a box. It’s better than traditional shipping because it’s cheaper, easy to return and way more convenient. When you get the mattress, it takes only a few minutes to unbox it. If you’re not satisfied, the mattress company will come and pack it back into the box.