**OOP**: This could stand for “Out of Print” or “Out of Production,” but in the context of envelopes, it might be a typo or an internal code. If it’s not a typo, it might refer…

How to Use OOP! C4 White Envelopes Pack of 10

Step 1: Gather Materials

• OOP! C4 White Envelopes Pack of 10
• Documents or items to be mailed
• Pen or marker
• Return address labels (optional)
• Postage stamps

Step 2: Prepare the Contents

• Ensure the documents or items fit within the C4 envelope size.
• Organize and stack the papers neatly if sending multiple documents.

Step 3: Insert Contents into the Envelope

• Place the documents or items into the envelope.
• Ensure the contents are placed securely and will not move around significantly.

Step 4: Seal the Envelope

• Moisten the adhesive strip on the flap of the envelope.
• Press the flap firmly to seal the envelope securely.

Step 5: Address the Envelope

• Write the recipient’s address clearly on the front center of the envelope.
• Optionally, place a return address label in the top left corner.

Step 6: Add Postage

• Determine the appropriate postage based on the weight and size of the envelope.
• Affix the correct postage stamps in the top right corner of the envelope.

Step 7: Send the Envelope

• Take the envelope to a post office or drop it in a mailbox to be sent.
• Ensure it is sent via the appropriate postal service as per your requirement.