18 x 14 x 12" (20 Pack) Medium Moving Boxes. With over 1,500 sizes available, BOX USA offers a large variety of packing boxes to choose from. Our Medium Moving Boxes are our most popular moving boxes. These boxes are ideal for packing most household items including books, kitchenware, clothes, linens, small appliances, toys and more. These boxes are professional grade and certified 200#/ECT-32 quality can hold up to 65 lbs. BOX USA B181412RP20 cardboard boxes 18 x 14 x 12 inch (L x W x H) are also designed to fit the most popular paper sizes. Ideal for packing, moving, shipping and storing paper materials; such as catalogs, literature, fliers, brochures, and letterhead. The single wall C-Flute corrugated fiberboard provides structural strength and crush resistance; making these cartons a durable choice for all packaging needs. Boxes are sold in bundle quantities, and are shipped flat to save on storage space and reduce freight cost. Corrugated cartons come in the standard Kraft color, and are made of recyclable cardboard. Listed dimensions refer to inside usable carton space.