How could I cheaply send a package heavier than 20kg (the post office maximum) to eg Bangkok?

Is there some way i can do this with one of the coach or songtao companies?

How could I cheaply send a package heavier than 20kg (the post office maximum) to eg Bangkok?

Is there some way i can do this with one of the coach or songtao companies?

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Just go to Nathon local bus station (not the one near the pier). First on the right after the first bridge. Daily buses to BKK. Write your mate's name and mobile number on the package and tell him/her where to pick it up in BKK. Ask driver/office for details. Safe, cheap and quick.