20 x 18 x 4" Flat Corrugated Boxes

This 20 x 18 x 4 inch corrugated box is a shallow-profile RSC carton built specifically for flat or low-clearance products. Constructed from ECT-32 single wall kraft corrugated board, it delivers reliable single wall strength in a compact 4 inch depth that prevents oversized boxes from adding unnecessary dimensional weight to shipments.

The generous interior base makes these boxes well-suited for framed artwork, apparel folded flat, book sets, electronics accessories, and trays or components from manufacturing lines. E-commerce fulfillment centers and retail distribution operations rely on this footprint for products that require a wide, stable base rather than vertical clearance.

Each box ships flat for compact on-shelf storage and arrives pre-creased for quick assembly on packing lines. Sold in bundles of 25, with each box weighing approximately 1.31 lbs, the bundle format accommodates both steady high-volume runs and smaller replenishment orders without case-quantity commitments.