Large Flat Rate Boxes 12″ x 12″ x 5-1/2″ Inside 12-1/4″ x 12-1/4″ x 6″ Outside 23-11/16″ x 11-3/4″ x 3″ Inside* 24-1/16″ x 11-7/8″ x 3-1/8″ Outside*
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