Our Single Wall cardboard box size DPB/14 is 381 x 330 x 305mm is a useful larger size for storage or posting of bigger items and bundles of smaller items that need lots of protection to avoid any damage occurring during transit. These top quality single wall corrugated cardboard boxes are delivered flat-packed for more compact storage. To make them ready to use you just push the box into shape and secure the base with a good quality packing tape. When you have packed your items simply use more tape to securely seal the top.