Archival Poster Boxes - Blue Corrugated

The material used for these BLUE E-FLUTE CORRUGATED CARDBOARD ARCHIVAL BOXES is a strong E-flute corrugated board that exceeds 200-lb-test. It is acid-free, lignin-free, and buffered with 3% calcium carbonate. The boxes have a drop front, metal-edged corners for stacking strength and ship assembled.
Museum-grade archival.