EcoBox Adjustable Picture/Mirror Box, Moving Box Set of 5 (V-9682) Set accommodates items up to 37" x 61" & approximately 3" in depth. Inner box (inside) dimensions are approximately 37" x 3" x 27 1/2". Outer box (inside) dimensions are approximately 37" x 3 1/2" x 30 1/2". Full-overlap flaps (FOL) provides extra stacking strength and edge protection. Perfect for artwork, mirrors, tabletops & other flat or narrow products.. Non-Skid natural rubber back 5 complete sets come with this purchase