What are these bags I found?

They could be glassine bagswhich are widely sold to stamp collectors. The stamps do not stick to these bags.

http://www.amazon.com/3in-2in-Glassine-Waxed-Paper...

Sadly enough, the glassine bags, which come in a myriad of different sizes, are also used by drug dealers.

From the Drugs-Forum:

"Correct me if I'm wrong, but I believe stamp bags are literally bags for stamps. Postage stamp collectors use them so the stamp won't get stuck to the glassine bag. And conveniently, nor will powders. In the drugs trade, it seems there is a double etymology with the term 'stamp bag'. They are used by stamp collectors, and they also get stamped with a brand" [by the drug dealers].

I really hope and pray that your son is a stamp collector.

Maybe you should talk to your son before assuming drugs ir anything. But it is a possibility. And if it is, it would be worse than marijuana because marijuana cant be stored in paper bags.. It could be wax

u should give more info or maybe take a picture of it, cuz it can be something dangerous. was there anything suspicious about it?

Need more info