Hiking Backpack Lightweight 600D For Running, Cycling, Hiking, Biking, And ?Ergonomic and Extra-comfort?Heytrip Hiking Backpack wearing system features chest and waiste adjustable straps that can be easily tailored to your body size and shape. This customizable fit ensures maximum comfort and stability. The ventilated mesh cover keeps your back cool by maintaining air circulation, preventing discomfort due to accumulated heat, and providing excellent air circulation and breathability. ?Ultra-lightweight Design?Designed with waterproof 600D Oxford Cloth, Heytrip Hydration Backpack weighs only 427 grams and can hold 6.56 liters in the main compartment. Just to unzip the compartment to get adequate space for your helmet, jacket or drone. In addition, the left and right mesh pocket are enough for 330ml bottles. Our backpack fit any essential in your backpack water bottle without overloading yourself. ?3 Liter TPU BLADDER Included? Manufactured from high quality TPU flexible food grade material, it?s BPA free. The Low-Profile fit for unmatched stability which reduces liquid movement for increased pack stability at high speed. An ergonomic handle and 4" opening for easier refilling and cleaning, and an O-ring Gasket built in tube connector and on/off switch that make it easy to prevent leaks. Insulating tube cloth keep water cooler in summer, prevent water from freezing in winter. ?4 in 1 Bladder Cleaning Kit?The order Include a Hydration Pack, a 3L bladder, and a set of bladder cleaning kit. 4 in 1 set for hydration bladder cleaning and drying----1* flexible snake brush, 1* smaller brush, 1* bigger brush and 1* collapsible frame. Stainless Steel 304: Strong and Durable; Brush is straight and enduring. ?We?ve Got Your Back?Whether you're an athlete or an outdoorsman, your water pack backpack always follows through when you need it. Let your Heytrip hydration pack backpack carry you through your next adventure. If for any reason the Hydration Backpack doesn't meet your standards, contact us and we'll make it right.