Anyone know what the proper rate is for a small bubble pack type envelope? I sent the following email to the USPS and their response follows. How am I to determine the rate if the postal clerks don't know what it is suppose to be?

This is my question and problem.

On 3/6/08 I mailed a 4" X 7" Duck brand Bubble Wrap envelope that weighed 0.80 oz and the postal clerk sent it as a First Class Large envelope for $0.80 postage and the following day I mailed four of the same envelopes and weights and the postal clerk said I had to send it First Class parcel at a cost of $1.13.

What is the proper postage for this type of mailer?
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USPS's response:

Dear WALTER DIBELER,

Thank you for contacting us about the rate to mail a 4" x 7" envelope that weighs $0.80.

You are welcome to estimate postage for your items by using our Postage Rates Calculator at:

http://postcalc.usps.gov/

1. Select a shape (If you need more information on shapes, click on the question marks.)
2. Input the weight for your item
3. Input the ZIP Codes™
4. Select the mailing service you intend to use
5. Choose any available extra services for the mailing

You can also find more detailed information regarding rates at the following link:

http://www.usps.com/rates/welcome.htm

If I can be of assistance to you in the future, please don't hesitate to contact me.

Thank you for choosing the United States Postal Service®.

Regards,

Marcell F