E Flute
E flute is approximately 1/16" thick and gives RETTDF mailers a slimmer, more refined profile with a smoother surface for detailed graphics and high-quality printing. Combined with the RETTDF’s reinforced roll-end sides and protective dust flaps, it provides a strong balance of presentation and protection without making the box feel bulky.
Best for: cosmetics, subscription kits, apparel, accessories, electronics, and other lightweight retail or ecommerce products.
B Flute
B flute is approximately 1/8" thick and adds more rigidity, cushioning, and stacking strength to the RETTDF structure. The thicker board works with the box’s reinforced sides and dust flaps to provide additional protection for larger, heavier, or more fragile products during shipping.
Best for: heavier products, larger RETTDF mailers, fragile items, and shipments needing added durability.
Simple rule: Choose E Flute for a slimmer, print-focused RETTDF and B Flute for greater strength and shipping protection.