The Speedsleev is a cinch to install. The pack lays out flat so you can easily slide your ride essentials into the pocket sleeves. When you are ready to ride, the whole pack rolls together tightly and securely with Velcro. There is another set of straps that you wrap behind the saddle rails, and then around the SpeedSleev to secure it all in place.
The ballistic nylon or full elastic external material layer compresses everything in place, even when you take items out.