Buy one or both. YourOwnBags.com by itself or YourOwnBags.com and GreenBagSales.com. They're going for a good price as the owners of YOB have other responsibilities now and GBS was a "starter" project and needs some TLC to grow and thrive. They get each other traffic and make a great pair. Everything you need to get started is included including the domain names, hosting, supplier names and introductions, instructions on use of the website "back ends" and advice on how to run and grow both businesses.
If you have a background in or equipment for screenprinting on non-woven polypropylene you'll have an advantage, but even if you don't, this is a good opportunity to make some money from home.
PM me for more information. You'll be surprised how affordable this is.