I have made many bags over the past couple of years. You definately need to add batting or iron on fleece. I use iron on fleece on the outside and sf101 iron on woven interfacing made by pellon for the lining. They both need to be lined to give the bag the body it needs. They will hold up better and look better when completed with the lining. The better they look the more you can charge. I can't give you a price to charge because I think the area you live in will influence that. Good luck, I hope this will help.