A table or clean floor are easy surfaces on which to fold the blazer.
This fold should reveal the inner lining of the blazer. If it doesn’t, start the fold further to the right of the blazer.
This technique works well for all shapes and sizes of blazers.
If the collar is up, fold it down so that it sits flat.
Purchase a garment bag from clothing or travel stores. Garment bags normally come with the hanger already attached. If there is no hanger, use your own and push the hook up through the hole at the top of the bag.
Purchase a dust bag from a shoe store. If you are also taking trousers, hang these over the rail on the hanger.