Best-selling Waterproof Outdoor Sports Backpack Shoulder Belt Bag For Biking Cycling Traveling Camping Hiking outdoor travel Hydration Pack 20L (Black) Specially Durable and Reliable backpack in stylish and fashionable design Adjustable and breathable padded shoulder and chest straps to meet different requirements for both men and women Featured with isolation layer to keep the temperature inside the water bag Dedicate breathable mesh bag in the bottom compartment specially for holding hamlet. High-visibility reflective stripes to improve visibility when in fog days or at night