Hydration BladderWater bladder is BPA free and FDA approved, coming in taste-free and leak-proof. Hands-free drinking tube with suction cup mouthpiece, gently bite to let the liquid flow. It is completely pressure-tolerant and leak proof for carefree biking, running, hiking and other outdoor adventures! Before your first use rinse out your bladder with lemon juice or warm water to remove any residues. Running Bags with Adjustable StrapsThe hiking backpack with hydration bladder, two belts are designed to solve the problem that chest straps will make the neck uncomfortable when riding. More importantly, the shoulder strap is adjustable and a clip is designed to fix the position of the drinking water pipe, so it will not swing randomly during exercise. Reflective Strip and Wear-Resistant MaterialThis hydration vest bag pack with reflective material, which can ensure safety in any light at night, even in light rain days, don't worry about the items in the backpack getting wet. It also uses wear-resistant materials, so you don't have to worry about your backpack being scratched when you are hiking, climbing or cycling outdoors. Compact & LightweightThe hydration pack adopts a compact design, which makes it feel light and stable on your back, and won't create a ton of wind resistance, reduce the burden of moving forward, and keep your body functioning at peak performance whether you are training for a marathon or cycling. Therefore, it is the best choice for road cycling/running/hiking! Suitable for Outdoor SportsThe water bag is adopt light and practical style, it is very suitable for riding, hiking, jogging, night running, mountaineering, adventure, marathon and other outdoor sports. More importantly, the backpacks are unisex, and also gifts for christmas, thanksgiving, father's day, mother's day, birthday gifts and other holidays. Specification: Material: Nylon Color: Black Weight: 0.33KG Size: 39*25*6cm (15.35*9.84*2.36 inch) Application: Men and Women (Unisex) Product Description