If you're looking to store them with minimal damage, you should really use archival garment boxes lined with acid free tissue. Once you do that, just try to keep them in the most environmentally consistent rooms in your house and avoid attic or basement storage. Alternatively, there are a number of display cases with hangers that open from the front if you'd like to rotate your jerseys for display.
Personally, I'd avoid any kind of PVC storage. Soft plastics like that are known to break down and transfer harmful gasses and chemicals. A simple hanger in a clean, bug free closet should suffice if you don't want to go the full archival route. A good cotton or polyester garment case would be an upgrade to keep dust off while still allowing easy access. If you do decide to go plastic, look for mylar or clear polyester bags. Both of which are inert, stable materials. If it's archival quality, it will most likely be mentioned as it's a strong selling point.
Here are a few links to a nationwide chain. You may have a store in your area. If not, you can order online or use this info to find something that might be more suitable for your needs.
Archival garment boxes.
http://www.containerstore.com/shop?p...=&Ntt=archival
Hanging storage.
http://www.containerstore.com/shop/c...garmentStorage