This 18L bike backpack is specially designed for bicycle lovers and walkers. With ergonomic design, this backpack give you more comfortable feeling. And made of high-quality and safe material, it is durable for long-time use. It will surely contribute to your fantastic outdoor experience. 18L cycling backpack, made of ultralight water-resistant and tear-resistant nylon fabric. Special hole design for water bag (NOT included). Adjustable shoulder strap, chest strap and waist strap to fit your need. Mesh and poriferous EVA design on the back for maximum breathability and comfort. Reflective strips for safe riding at night. Mesh cover to hold your helmet. Rain cover to be used in heavy rain. Detachable pouch for store your cellphone. Suitable for outdoor activities like cycling, camping, mountaineering and hiking, etc. Buy this Backpack and you can Get 12% Off for 18L Water-resistant Breathable Cycling Bicycle Bike Shoulder Backpack Ultralight Outdoor Sports Riding Travel Mountaineering Hydration Water Bag with Rain Cover.