If you're looking for easy, dash-board-style access to your stuff for road, touring, or triathlon riding, the Louis Garneau Aero Gel Box 2 gives you all the convenient storage of a seat bag, but with the top-tube/stem mounting you get easier access and better aerodynamics. A hook and loop opening means you can grab your gels on the fly, and access your tools or phone without having them dump out all over the place. Foul weather? Slap on the rain cover and go.
Hook and loop fastening to head tube and top tube is secure and easy