Side loading cardboard corrugated boxes 44″ x 6″ x 35″ 275#/ect-44 – 10 pack these cartons open along the ends for easy insertion of frames, mirrors and other flat products. designed with full overlap (fol) flaps for added protection manufactured from 275#/ect-44 kraft corrugated boxes are sold in bundle quantities of 10 and ship flat to save on storage space and shipping for help selecting the right box, click the brochure tab below.