Here is how I mail three INEXPENSIVE 14-gram chips for $0.79. I send them by the first class LETTER rate (because the end product is no more than than 1/4" thick). I use a small regular envelope (6-1/2" x 3-1/2"). I include a half sheet of paper for my note and a business card. It ends up weighing just under 2 ounces. Again, the cost is $0.79 ($0.42 [first ounce] + $0.17 [second ounce] + $0.20 [surcharge because the envelope will be rigid]). I have never had a problem with the post office in any way, and I have sent many chips this way.

I sandwich the chips between a folded piece of cereal-type cardboard. I tape this package of cardboard and chips. Then I tape the package to the envelope (so nothing slides about)! Then I insert the half sheet of paper note and a business card. Then I seal and tape the envelope. Pictures below.

(I suppose that if you have a lot of outgoing mail, it might be better to pay more and use bubble envelopes.)

Robert