Send items in small Jiffy Bags

Hi, I am looking to send my first shipment to Amazon Fulfillment Centre.
I usually put my items in a small plastic ziplock bag and then the packaging is a Jiffy Bag.
My question is, do I still need to send my items in Jiffy Bags or does Amazon use their own packaging. And if I need to send them in Jiffy Bags does the Amazon barcode need to be on the plastic bag and left open or on the Jiffy Bag and sealed.
Sorry for the long post but I can’t find the information anywhere else.