Printed envelopes with plastic film, there are four benefits:
1. Plastic mail envelope bag is not afraid of water, in the delivery and transportation process, even if it is raining, or by water and other accidents, it will not harm the letter.
2. Plastic mail envelope bag high strength, can withstand handling, tearing, stronger than kraft paper envelopes.
3. Plastic mail envelope bag easy to use, because the seal printed with stickers, packaging and unpacking are easy, without tear or cut. Four is low cost, about 10-20% less than kraft paper envelopes.