OGIO has a great tail bag on amazon for about 90$ USD. This is also the same one Licensed with Dainese. I also have a Klim backpack that I use on my other bike. Its a small bag very secure and comfy over my Dainese jacket. Also has a bladder bag available. I put my laptop in a foam sleeve and then in the back pack. There is room for my gym clothes, "can" style headphones and water bottles. I'm not big on back packs but this one is very comfortable, secure, and functional.