Double Wall Shipping Boxes 20x20x20 — 10/Bundle

Yes, you can and should place a shipping label directly on the box. For carrier compliance with UPS, FedEx, and freight carriers, your shipping label should be clearly visible, unobstructed, and placed on the largest face of the box. Double wall corrugated boxes meeting ECT and Mullen burst strength standards are recognized by major carriers as compliant packaging. For palletized shipments, labels should face outward and remain accessible for scanning throughout transit.

To properly apply a shipping label on your 20x20x20 double wall corrugated box, place it on the largest, flattest face of the box — typically the top panel. Ensure the surface is clean and free of tape or seams before applying. The label must include the recipient's full address, your return address, and any required handling instructions such as 'Fragile' or directional arrows. The white corrugated finish available on these boxes helps labels and printed instructions stand out clearly for easy scanning and reading throughout transit.

Double wall construction means the box is made with two layers of corrugated fluting sandwiched between three flat liner sheets. This provides significantly greater stacking strength, burst resistance, and puncture protection compared to single wall boxes, making it ideal for heavier or more fragile items requiring extra durability during transit.

A 20x20x20 double wall corrugated box rated at 275# (double wall ECT) can typically support contents weighing up to 65–80 lbs depending on the specific ECT rating and stacking conditions. Always verify load requirements against the box's burst and edge crush test ratings before shipping heavy goods.

These double wall shipping boxes are certified to ASTM D5118 (corrugated fiberboard boxes compliance standard), ASTM D4727 (corrugated and solid fiberboard packaging materials), and CSA Class Code A standards. These certifications ensure carrier compliance and reliable protection throughout the shipping chain.

Clear carton sealing tape or white paper tape applied in an H-tape pattern on both the top and bottom flaps is recommended. For heavier contents, use 2-inch wide reinforced tape to ensure flap integrity throughout transit, especially when boxes are handled by freight carriers or palletized.

Yes. Cardboard Boxes 4 U offers custom printed corrugated boxes including the 20x20x20 size. Custom printing allows branded messaging, handling instructions, and logos to be applied to your boxes. Contact the sales team at (888) 333-9513 or Sales@cardboardboxes4u.com for custom print pricing and minimum order details.