These ARCHIVAL FILE BOXES are available in both full- and half-sizes. Both styles are made from acid-free, lignin-free, B-Flute corrugated cardboard. They have a pH of 8.0-9.0 and have a 3% calcium carbonate buffer. Museum-grade archival. Half- size cartons come with handle holes and hold a manageable weight for carrying or lifting onto high shelves. The full-size cartons hold both letter and legal file folders and also come with handle holes. File boxes ship flat and fold together.