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How to address clasp envelopes
Consider an adhesive label.
If the clasp on your envelope makes it difficult to write legibly, think about purchasing a sticky address label from a post office or stationary store. You can write on the label on a flat surface, then peel it off and fix it onto the envelope.
If you decide to write directly on the envelope, just continue to the next step. The return address label should be smaller than the main address label.