I carry a small handgun most of the time.....except when riding my bike. My normal method of carry is a S&W CS9, 640, or KT p3at carried IWB in quality holsters. This works on the bike if I'm only wearing jeans and no jacket (which is rarely). If I wear a mc jacket, it's tight enough that the pistol gets shoved around uncomfortably, or the grip becomes exposed. I usually wear textile or leather mc pants, which won't even accomodate my holsters, so I go unarmed. I've been thinking about getting a shoulder rig for the flat KT or CS9, to be worn under the jacket. But I don't know if I'd like wearing a shoulder rig. And, I'd like it to be concealed even with the jacket unzipped. I have a fanny-pack with an internal holster for a compact Glock but it's way too bulky and tries to compress my gut when I lean forward on the bike. Maybe I could try a smaller one, but it also interferes with unzipping the jacket, I think they all would. I have considered making and attaching some kind of mount to attach a holster to the inside of the jacket, but the zip-out linings would make this difficult. What do you guys use?