YKK Shockonlok™ main buckle resists water absorption often caused by high humidity. Properties are stable under extreme temperatures such as cold mountain top air and desert heat. Nylon grip strap helps keep the strap from loosening up and keeps it secure to the body. Removable flap reduces weight for lighter ride days and less hassle for mechanics. Tire tube pocket is big enough to fit a spare tube or other necessities. Tool compartment with key loop, clear plastic bolt pocket, fold down mesh pocket and elastic straps specifically designed to fit the basic tool necessities needed to fix your bike on the trail. No-slip back keeps pack in a secure position on rough terrain. Water bottle side pocket. Side tool loops are wide and clutter free.