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When there is a need to send unfolded sheets A4 sheets over the mail, the 9 X 12 office envelope is perfectly suited for the job. These large envelopes are often used to send product catalogs, agreements, offer letters, medical reports, and tax paper. When durability is of paramount importance there is no looking past Tyvek catalog envelopes. These envelopes are made from high-strength Olefin, which makes them moisture and tear resistant. These 9 X 12 - 14 Tyvek Open End Catalog envelopes also come with the Kwik-Tak sealing system. This makes sealing the envelopes as easy as peeling the protective tape, closing the flap, applying pressure. These highly durable envelopes have a 12 inch height and 9 inch length and they have an enclosure space of 8.75 x 11.5 inches. Thanks to their enhanced durability, these envelopes are often used to send international and long-distance domestic mails. These envelopes have a bright white color and a blank windowless design.
Because sometimes you need an envelope than can be dropped in the rain, mauled by the postal machines, snagged by unforeseen sharp edges, tackled by rabid raccoons and still keep your documents safe.
And the self-adhesive closing edge, even if I also use packing tape.