The ultimate aim is to ensure all outer packaging is free from plastic and is recyclable, biodegradable or made from recycled materials. As of 2019, the only mailing envelopes I use are Green Jiffy Bags, which are made from recycled materials and contain no plastic. I also phased out plastic FRAGILE tape in favour of a stamp, and my return address labels are made from recycled paper.
Regarding internal packaging, I am phasing out standard cello bags and replacing them with biodegradable Eco Craft bags. While some vendors don’t use cello bags at all, I feel that it’s important to store and mail paper items in a waterproof case. Cello bags also help keep products free from dust and fingerprints. I also use paper bags (easily recycled), stickers made from recycled paper, and business cards and compliment slips made from pulp.