?Fit You Well: Ergonomic designed vest-shaped bag coming with adjustable waist strap and high elastic chest strap,two sizes for your option.This backpack can be used for more than running and hiking.It is suitable for almost all outdoors activities such as running, riding, camping, marathon, etc. ?Comfortable Fit Vest Pack: Fully adjustable shoulder and chest straps that 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. ?Multiple Storage Compartment:Designed with 6 exterior pockets, you can store all tiny items such as vacuum cup, keys, wallet,phone and cash etc. There's ample room upfront for another bottle, wallet, keys, and other small items. The rear storage is big enough for backup bottle, headlamp, buff and etc. ?Hydration System:Bladder compartment with hanging system,Aonijie running vest compatible with 2L bladder (not included);2 Front flask pockets with secure loops,Make it easy to drink and stays balanced when you run. ?Lightweight For Running: 5.5L race vest only, the backpack weight is 8.82oz/250g super light, reducing much of the load during the running.When it comes to running, the shorter you plan to spend on the trail, the lighter pack you'll need.Design for middle or long distance running.

Best Sellers Rank: See Top 100 in Sports & Outdoors. Capacity: 5.5 Liters. Strap Type: Shoulder, Chest Strap. Sport: Running. Color: Gray. Brand: AONIJIE. : B07QQYFL7L. Manufacturer: Aonijie. Date First Available: April 16, 2019. Package Dimensions: 11.85 x 6.38 x 2.05 inches; 8.78 Ounces.