Bubble mailers are a must when you send chips thru the mail. If you use a business envelope, the P.O. sends this mail thru a sorting machine.Chips get pushed out of the envelope & even sometimes get broken. experience is the best teacher. I have been thru this on both ends. I will stop trading with a person who does not use bubble mailers.Business type envelopes are no good for us no matter how well you package the chips. Scotch tape over all 4 sides of a business envelope will keep chip from escaping envelope, but does not assure that it will arrive in one piece. Please use bubble mailers !!!!!!