Elasticated belt to reduce pack movement and increase comfort. Additional elasticated pocket on bottle holster for essentials (phone/MP3 players). Easy slide bottle guide650ml hydration bottle & 150ml gel bottle included. External shock cord secures unworn apparel. Angled, insulated holster for easy access. Zipped mesh pocket for small essentials. Air mesh wicking backing for added comfortID Card and reflective trim add safety and security. Fits 26″ to 42″ waists