Can I send a first class bubble envelope using regular postage stamps?

I want to send a pair of earrings via First Class in a small bubble envelope. It weighs two ounces. The USPS website says it will cost $1.00 to ship it First Class. The problem is that I only have regular stamps and I don't want to drive all the way to the post office to ship it. So can I just stick on 3... show more I want to send a pair of earrings via First Class in a small bubble envelope. It weighs two ounces. The USPS website says it will cost $1.00 to ship it First Class. The problem is that I only have regular stamps and I don't want to drive all the way to the post office to ship it.

So can I just stick on 3 regular stamps (42 cents each) on the bubble mailer, write "First Class" on it, and leave it for the postman to pick up?
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