<https://leafymovingboxes.com/product/medium-box/#product>
<http://schema.org/description>
"This box size is perfect for packing heavy items such as books and canned food items. Add on individual medium boxes to any order.\r\nMedium box measure 21″ x 15″ x 12″\r\nAvailable as an add on only. Cannot be rented without a moving box package."
<https://leafymovingboxes.com/product/medium-box/>