Features: Fully adjustable shoulder and chest straps guarantee the perfect fit, keeping the pack from bouncing while running. Designed with a unique padded back section to allow airflow between your back and the pack. Soft mesh on back and shoulder straps maximize breath-ability. 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. The running vest is compatible with a 2L bladder (not included). Quick release leak-proof bladder connector. Water can be taken it out easily when running. Convenient trail running backpack outfit. This backpack is designed with multiple storage pockets, Gives you all the space you need to store your essentials. Whether it's an extra kettle, a phone, or a key, different sizes of pockets are available for your storage needs. Energy replenishment warehouse, help forward. These pockets also allow you to get things directly, extremely convenient. Our ultra running backpack aims to accompany your trip of Running, Marathon, Jogging, Cycling, Backpacking, etc, Firmly shape the body without reducing too much volume and slowing down. Details: Type: Sports Backpack Gender: Unisex Material: Nylon Color: Black, Gray, Blue, Green Size: 40 x 30 cm / 15.75 x 11.81 inch Recommended Chest Size: 70-120 cm/ 27.56-47.24 inch Weight: 220g/7.76oz Features: Water Splash-proof (Not Really Waterproof), Breathable, Ergonomic Design, Anti-skid & Shock Absorption Suitable for: Running, Cycling, Climbing, Trekking, Camping, Hiking, Fishing, Skiing Notice: 1. Manual measurement, please allow 1-3cm error. 2. The real colour of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. Package Includes: 1 x Backpack Contact US: Please contact us for any reason before opening any case! We are willing to work out any problem or issue with you, thank you! Serious Buyer Only! Please place order only if you agree with all the terms. We accept the payments managed by . All items will be shipped within 3 working days after payment received and cleared (excluding Sat, Sun, and holiday). Item prices do not include import duties, taxes or other charges. We are not responsible for any custom duty or import tax. We offer refund or resend if item is defective or you are not satisfied with it upon receiving. ALL replies will be sent to your email, if you don't get response within 1-2 business days, pls check your My