One time I mail ordered socks from REI, they were delivered in a giant tyvek(?) mailer bag. 18" wide x 24" long. seemed excessive for such a small item.
I cut the two long sides of the bag, to MYOG footprint 18" x 48" (24*2)
it has a "peel here to seal" glue side. haven't decided if I want to cut it off or that could be useful somehow in the future.