I'm looking to get my wife a concealed carry fanny pack for her XD9 Sub Compact. Been looking at the Blackhawk which seems pretty good, but a bit bulky. She's a runner, so she's looking for something that's going to keep it in place pretty good which the Blackhawk seems to do. If we do go this route, I'm assuming the small would suffice? I may be interested in one for myself for my XD9 4" compact. Would a small fit that as well or do I need to go medium? Non-Blackhawk recommendations are very welcome! I'm not biased - just want to get what's right for both of us. Thanks!