Daily rides and longer trips both go smoother when carried weight stays centered, and the Apidura Expedition Frame Pack sits inside the frame so the bike keeps its natural handling. Four Hypalon stability straps and silicone print on the pack edges help lock this waterproof frame bag in place, while frame-fit panels follow the shape of the tubes. What Our Gearhead(R) Experts Are Saying:"Frame geometry decides whether a bottle fits alongside the pack, so I checked clearance on my own bike before I settled on a size. A side-entry cage kept the bottle easy to reach when space was tight."