Great ideal for business,conference,office,meeting,working,restaurant,school,test field,business travel and many more!Sports backpack,made of ultralight waterproof nylon fabric.Adjustable shoulder strap,chest strap and waist strap to fit your need.With whistle design on the chest strap.Ergonomic design on the back for maximum breathability and comfort.Reflective strips for safe riding at night.Rain cover included.Suitable for outdoor activities like cycling,rock-climbing and hiking,etc.Boost your brand when you give out this cycling backpack to customers! Measuring 11.8*18.1 inch, this custom waterproof cycling hydration backpack with water bladder. Usage Scenarios: Office supplies, school stationery, corporate promotions, trade show giveaways. We offer logo printing and full packaging customization. Product Highlights: Portable, durable, practical for daily use.