Features: Made from waterproof polyester material, abrasion and scratch resistant. Ergonomic back design, soft, comfortable and high air ventilation. Adjustable mesh shoulder straps with sponge padding for added cushioning and support. Waist straps are designed to alleviate burdens and to ensure stability while cycling. Reflective design enhances visibility and safety at night. Perfect for running, cycling, mountaineering, hiking, fishing, cross-country and other outdoor activities.