Fit & Design: Fully breathable AirMesh construction with cushioned compartment is non-chafing and bounce free Fully adjustable stretch-comfort waist belt with low-profile quick-release buckle Large zippered internal compartment with divider for fuel, electronics, and more with 3 quick access pockets for keys, cards, and other small essentials Dual quick access external pockets perfect for gels, nutrition, and more Breathable AirFlow(TM) mesh circulates air between your back and the pack eliminating sweaty hot-spots Belt Width:1.5" Storage:10" x 4"