So this link came up at the top of homebrewtalk. I was intrigued by the idea of a slightly cheaper carboy with free shipping.
However, the description says "The Plastic 6 Gallon Carboy is ideal for a secondary fermentations and bulk storage of wine or beer. It`s made of clear PET plastic, the same material used to make 2 liter bottles, only this plastic carboy is thicker and heavier. It`s completely taste and odor free and impermeable to oxygen. That means you can use this plastic carboy to bulk store your wine as long as you like. "
Why secondary fermentation and not primary?