For safety and greater security it is better to use double window envelopes. Most of the two window envelopes are specifically designed for laser checks. Mostly their sizes are similar to the regular size of the simple envelopes in the market. Because it has a high security lining over the first layer, you cannot normally through them to the contents.Do not buy the cheap hoax varieties that are available in the market. If you want your information in safe hands, then buy envelopes measuring 8 3/4 by 3 9/16. There are a variety of cheap imitations that are available at low cost.
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