Auspost eBay Flat Rate Satchel

If I turn a flat rate satchel inside out and just say it's my own packaging, how should I attach the label?
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This is a good way to re-use quality packaging material. l would suggest that the label is applied using clear broad sticky tape (even if the label is self adhesive), making sure that the label is well sealed-in to ensure it isn't  torn off during the transit process.