These are so usefull! I personally use them to pack my tax return docs. But these are Perfect for Mailing a Variety of Big Documents including: Photography, cards, invoices, catalogs, oversized wedding invitations,Forms... and what not?!
These are wonderful for the new box cards I am making. The cards are larger than "normal" and have so many dimensions making them "puffy" and not fitting in my regular size envelopes. The cards fit in these envelopes.