i hate to sound ignorant, but is stabilizer necessary? or would interfacing be ok? or both? or is that redundant? gah!
I think the two words tend to be used interchangably. I think of stabilizer as the stuff you use when machine embroidering and interfacing as the stuff you use in garments and bags. I use a mid-weight interfacing and usually fusible fleece in many of my bags/purses. Some people like a stiffer bag and use a heavy-weight interfacing. I also use fusible interfacing rather than sew-in most of the time as I find it quicker and easier. You could use canvas for an inner layer as well (this is good for market bags or any bag you want some drape to rather than stiffness). I find that for some bags, fusible fleece is enough for the body I am looking for. It is what you use as the inner layer that gives the bag body, so it really depends on what you want the end product to be like.