Running Hydration Vest Breathable Hydration Pack Backpack Large Capacity Riding Hydration Backpack for Climbing Hiking Traveling Hydration Pack Backpack Breathable Functional Running Vest Large Capacity Sports Cycling Water Bag for Climbing Hiking Traveling Features: 1. Multifunctional Storage: This running hydration vest offers up to 12 pockets for versatile storage options, including space for your smartphone, soft flasks, energy bars, and trekking poles, catering to the diverse needs of outdoor enthusiasts. 2. Elastic Comfort: Designed with an elastic seal and crafted from high-quality polyester, this hydration pack backpack can be adjusted for a personalized fit, providing exceptional stability and comfort to enhance your active endeavors. 3. High-Capacity Hydration: With its large pockets and 12-liter capacity, this portable hydration bladder backpack not only satisfies your hydration needs but also carries other outdoor essentials, making it the perfect companion for hiking, cycling, and various outdoor adventures. 4. Durable & Breathable: Made from premium polyester, the functional running vest is built for durability and breathability, ensuring comfort during extended outdoor activities and standing up to the wear and tear of your adventures. 5. Versatile Use: Ideal for running, hiking, cycling, climbing, or traveling, this lightweight hydration pack vest is a universal outdoor partner, ensuring you stay hydrated and comfortable during any adventure. Specification: Origin: Mainland China Main Material: Polyester Color: Black Size: S, M, L, XL, XXL Package Size: About 36cm (14.17in)*24cm (9.45in)*5cm (1.97in) Net Weight: About 230g/240g/250g/260g/270g Recommended size: S (suitable for chest circumference of about 78-86cm/30.71-33.86 inches) M (suitable for chest circumference of about 87-92cm/34.25-36.22 inches) L (suitable for chest circumference of about 93-99cm/36.61-38.98 inches) XL (suitable for chest circumference of about 100-107cm/39.37-42.13 inches) XXL (suitable for chest circumference of about 108-120cm/42.52-47.24 inches) Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. 1*Running Hydration Vest