We use real cork fabric from Portugal in our Swift in Cork, Little Swift, Imago, Clear Organizer Wallet, and Cork Organizer Pouches. Cork is naturally water-repellant and very durable; other than the natural darkening of the fabric that occurs over years of use, you guys report back to us that your cork bags look as new as when you began using them.
A single cork tree with a lifespan of up to 200 years can be harvested for its bark every nine years, and cork forests support one of the world's highest levels of forest biodiversity, providing a haven for wild birds and the Iberian Lynx, among other species (although we don't know why the lynx is named that, because it doesn't look like our Iberian red at all; it doesn't even have the white grid pattern.) For more on the environmental and social impact of the cork forests of Portugal and their harvesting, watch this World Wildlife Fund video.
Want another way to support cork forests and the folks who earn their living harvesting them? Look for wines that use cork (instead of plastic) stoppers.