Repost: Someone please respond this time!

[whycantibeajedi.livejournal.com]

Hi, I'm a new poster to this community, and I'm planning on posting the cell phone cozy I'm making once it's done. My current question is: should I insert a piece of cardboard or other hard material inside the fabric to make it stiffer? Or should vinyl be strong enough to be a decent case? I apologize about the text-only. Pictures will follow with the completed project :)