Adjustable-Height Cardboard Boxes
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A
Fold along the built-in incremental creases to customize the height of these boxes. They meet ECT 32 (32 lbs. per inch), which is comparable to a 200-lb. burst strength. Edge Crush Test (ECT) standards measure the amount of force a carton can withstand before the edges collapse. Shipped flat.
Style A boxes are sized for mailing catalogs and books.