What type of packaging should I use for a computer game ?

I'm sending the Sims 2, which I have sold on ebay, through the mail. It can't fit in an envelope so I'm going to have to use a box. Should I use first class mail for the box or should I use parcel post?|||I would recommend parcel post as it is less expensive for the same service. The more important issue is the protection of the game. Since a game disc is fairly light, I suggest wrapping it in bubble wrap to prevent the disc from moving around inside the box during shipment. The actual box should do the rest of the protection.|||Parcel post.|||Use Parcel Post, but make sure you have it in a protective casing.