Have you sent mails before? Not email, but paper mail or poly mailing which needs the envelopes. Maybe you also have such experiences that mailing letters with envelopes form home. I did it always when I was a middle school student. I remember that we often went to an envelope shop to buy the c5 brown envelopes, then we wrote many letters to our friends. To be honest, I always thought about that letters, I did not know why we always had so many things to talk in the letters. Maybe it was another interesting and fun thing for sendingletters with envelopes. During that time, in my memories, we just got the simple envelope; never see other kinds of envelope. But now in the modern society, with all the things developed better and better, we can find there are a variety of envelopes and envelope printing. And you know that there are numerous envelope manufacturers or envelopes stores to provide the envelopes to meet the different requirement. If you want to send big documents or other things, you need the large mailing envelopes; if someone needs some book, and you would send them, now the book mailing envelopes are necessary. If the things need to be mailed by ships, then flat rate shipping envelop will be a good choice. And if your mails are very urge ones which needed to be sent soon, the priority mailing envelope can help you a lot. If your things are not so strong enough, need something to protect them, now you can choose the padded mail envelopes, especially the ups padded envelopes which is the best quality padded envelopes, you need not to worry about your mail no matter how long it would be last. . If you do not want to pay many times for your mails, you can buy the flat rate mailing envelopes. Of course, you also can buy the priority mail padded envelop which can protect the things in your mail to be safe and would be sent earlier than others. If your letters were in the padded flat rate envelop, you need not to pay for them again and again, but just can pay once for them, and they also can be protected well. besides, if you want to have the three services together, then you can buy the priority mail padded flat rate envelope, which includes the three advantages, but the only shortage is that it is a little expensive. Have you heard about the Usps? It was the short name for United States Postal Service, a large post company, is famous for their best service, quick speed and good products and so on. Once, I had something need to be sent to my home in China when I was in USA. Someone told me about Usps and he suggested me to mail things from there, they would give me the best services. To be honest, I did not believe all the words. So I tried it, I sent one mail with usps flat rate padded envelope from Usps, and another with flat rate padded envelope from other mail company. After nearly a week, my family called me that they got a mail from USA, they like the things that I sent to them. They also told me that there was usps logo on the envelope. I asked if there was another mail reached, they said just the one. The things I sent to them was a bottle, very beautiful. And another one was also bottle, but after another 7 days, my family told me that another mail reached them again.