Ems envelopes don't need to be stamped. Letters should not be sent, and resumes should not be folded. This belongs to delivering documents. You should use ems directly, but it's more expensive. It costs hundreds of dollars for you to send 20 copies. See if there is a courier company. It will be cheaper to send it by express.

However, you said that your place is small, so it is estimated that there is no courier company. Or you can go to the town a little closer to you to find a courier company to see if it is cheaper to send ems locally or to find a courier company in the city. You can weigh it yourself.

Or send an electronic resume. It's both economical and fast.

If it doesn't work, use the ordinary mail of the post office ~ ~ ~ it's slower.

It seems that I can only send letters in envelopes of the post office, but I can't do it myself. If you do your own packaging, it means sending the package and weighing it.