Paladineer 20L Cycling Backpack Hydration Backpack Daypack for Running Hiking Cycling Durable Material & SBS Zippers: High quality lightweight, water-resistant, tear-resistant and sturdy Nylon material for prolonged use; Well made solid, strong , exquisite and metal SBS zippers for smooth slide Ventilated Panel & Adjustable Straps: Internal frame suspended mesh back panel to keep your back cool; Padded and S-curved straps to reduce the weight; Sternum strap, wider waist belt and side compression straps to offer extra stability Multiple Compartments & Many Pockets: Direct zip access hydration compartment; Main compartment with internal mesh pockets, vertical pockets and fabric sleeve; Zippered scratch-free sunglasses pocket; Front zippered easy access pocket; Stretch mesh side pockets; Dual zippered hip belt pockets; Detachable cell phone pocket Hydration System & Safety Design: Modular hose clip to stow the drinking tube in one easy snap; Hidden tube outlet to allow the drinking tube to go through the hydration compartment; Safety whistle on the sternum strap to help in emergency; Front and back reflectivity to enhance the visibility in low light condition Rain Cover & Helmet Cover: Integrated detachable raincover in the bottom pocket for quick access to keep the gear from storm; Helmet mesh cover in the bottom pocket for practical use in the cycling; Universal helmet hooks and attachment loops to hold the helmet tightly