Explore Materials: cardboard

Rigid, lightweight board with smooth brown sides. The thinnest possible flute creates sturdy support, making this board an excellent substitute for thick folded cardboards. One inch of this board can withstand 23lb pressure on the edges (23ECT). (144 flutes/f; 0.5mm)

White on the top (shades may vary - ask sellers for samples), more suitable for full-color prints. Brown on the back. The thinnest possible flute creates sturdy support (great substitute for thick folded cardboards). 1in of this board withstands 23lb pressure on the edges. (0.5mm high,144 flutes/f)

Thicker white top creates an excellent printing surface and adds strength to the board (perfect substitute for thick folded cardboards). Brown on the back. 1in of this board withstands 26lb pressure on the edges. (0.5mm high,144 flutes/f)

Heavier (marked 275), white paper on both sides has a smoother surface and adds stiffness. Perfect for two-sided color printing. The thinnest possible flute creates sturdy support (great substitute for thick folded cardboards). Edges can withstand 32lb/1in pressure. (.5mm high,144 flutes/f)

Thin layers of brown kraft paper on both sides - cost-effective solution for F-flute lightweight packaging - second smallest flute, sturdier and stiffer than G-Flute. Withstands 23lb pressure on the edges. (0.75mm; 128 flutes/f)

Premium white smooth, slightly glossy layer on the top, white on the back, and white lightweight thin F-flute - second smallest flute, sturdier and stiffer than G-Flute. Withstands 23lb pressure on the edges. (0.75mm; 128 flutes/f)

Smooth brown kraft paper on both sides, with good puncture-resistance; brown thin lightweight F-flute - second smallest flute, sturdier and stiffer than G-Flute. Withstands 26lb pressure on the edges. (0.75mm; 128 flutes/f)

Premium white, slightly glossy top, white on the back, and lightweight F-flute - second smallest flute, sturdier and stiffer than G-Flute. Great crush and puncture resistance. Withstands 26lb pressure on the edges. (0.75mm; 128 flutes/f)

Smooth bright white paper on the top, brown inside F-flute lightweight packaging - second smallest flute, sturdier and stiffer than G-Flute. Withstands 26lb pressure on the edges. (0.75mm; 128 flutes/f)

Premium white, slightly glossy paper on the top, white inside, and white lightweight F-flute - second smallest flute, sturdier and stiffer than G-Flute. Withstands 29lb pressure on the edges. (0.75mm; 128 flutes/f)

Smooth brown surface on front and back with excellent crush and puncture resistance F-flute packaging - second smallest flute, sturdier and stiffer than G-Flute. Withstands 32lb pressure on the edges. (0.75mm; 128 flutes/f)

The highest-quality white paper is printed and then laminated onto a corrugated board. Brown inside. F-flute lightweight - second smallest flute, sturdier and stiffer than G-Flute. Withstands 32lb pressure on the edges. (0.75mm; 128 flutes/f)

Outside: Kemi white clay-coated surface with a smooth premium finish. White inside. F-flute lightweight packaging - second smallest flute, sturdier and stiffer than G-Flute. Withstands 32lb pressure on the edges. (0.75mm; 128 flutes/f)

Smooth bright white on the top. Brown inside. F-flute lightweight packaging - second smallest flute, sturdier and stiffer than G-Flute. High stacking strength and puncture resistance. Withstands 40lb pressure on the edges. (0.75mm; 128 flutes/f)

Brown kraft on both sides. Extremely high crash and puncture resistance F-flute lightweight packaging - second smallest flute, sturdier and stiffer than G-Flute. Withstands 42lb pressure on the edges. (0.75mm; 128 flutes/f)

Natural brown kraft on both sides. Thin lightweight E-Flute is twice as thick as F-Flute and provides higher stiffness and crush resistance. Withstands 23lb pressure to the edges. (1/16"(1.5mm); 90 flutes/f)

White top, brown inside. Most common medium postal grade. Thin lightweight E-Flute, 125 means it has a thinner top paper and may show some flute relief. Compared to F-Flute, provides higher stiffness and crush resistance. Withstands 23lb pressure to the edges. (1/16"(1.5mm); 90 flutes/f).

The highest-quality white paper is printed and then laminated onto a corrugated board. Brown inside. Thin lightweight E-Flute, twice as thick as F-Flute, provides higher stiffness and crush resistance. Withstands 23lb pressure to the edges. (1/16"(1.5mm); 90 flutes/f)

The highest-quality white paper is printed and then laminated onto a corrugated board. White inside. Thin lightweight E-Flute, twice as thick as F-Flute, provides higher stiffness and crush resistance. Withstands 23lb pressure to the edges. (1/16"(1.5mm); 90 flutes/f)

Common/Medium Grade/Postal Grade. Outside: Kemi white top (brighter, smoother than the regular white top). Brown inside. Brown inside.Thin E-Flute, twice as thick as F-Flute, provides higher stiffness and crush resistance. Withstands 26lb pressure to the edges. (1/16"(1.5mm); 90 flutes/f)