The Ortlieb Accessory Pack securely tethers to your Handlebar-Pack, giving you ingenious storage for smaller extras, such as your smartphone, wallet, route-marked map, and other accessories. It's fully waterproof, so you won't have to worry about sudden downpours and securely attaches to Ortlieb's Handlebar-Pack with its secure metal hooks. You'll find it does come with adjustable hook-and-loop straps, in case you're riding on a shorter route and don't require Ortlieb's Handlebar-Pack for carrying an overnight shelter and sleeping bag.