For sending delicate photos, diplomas, schematics and works of art, nothing is as efficient as these rigid and durable flat 11x17 mailers. Their tabbed ears easily slip into the slots for a secure seal. With these 11-inch by 17-inch flat envelopes, you don't need cardboard inside, because they're designed not to bend or crush during shipping. Ship your oversized business documents flat in this economically-priced mailer to send important materials safely and inexpensively. Each package contains 10 envelopes for ledger and tabloid size documents.