Hi Stephanie,
Many options, what leather are you using? If it is heavy enough just stitching is enough. If not you might put a scrap piece of leather inside and then go through both layers with your stitching. Something else you might take into consideration is the placement the attachment. With a lot of weight the straps can pull your bag out of shape without proper support and placement. Sure others have ways to accomplish this as well. Pics might help as well.
Kathi
