Ziploc XL bags and Pirate Ship
I've used those XL bags from Ziploc, they're the size you can put sports balls into, etc. I've found them on Amazon and I think Target. That way I know that moisture and staining are much less likely to happen. I also recommend pirateship.com. I have used them numerous times now, and the discounts are solid. You don't have to be a business or have anything special to register on their website. It's been a huge savings.