The Syncro 20 is the largest model in this product line. It boasts ample space, and is a good choice for bikepacking. Its zippered tool pocket keeps your pump, tire levers and other small items in check. - The harness system is optimized for cycling - AirSpeed back panel made for active sports: it allows for air flow between your back and the pack - LidLock helmet holder - Scratch-free pocket for sun glasses and phone - LED light attachment - Compression straps - Integrated hi-vis rain cover - Kangaroo pocket at front panel - Stretch side pockets - Chest strap with magnet for compatibility with Osprey hydration bag's drinking heads - Lightweight waist strap