Tagvo Cycling Hydration Backpack Water Reservoir Kit with 2L Water Bladder, Backup Bite Valve, Reflective Strip for Evening Safety Chest Buckle for Avoiding Bounce, Washable for Biking Camping Hiking polyester HYDRATION BLADDER: BPA Free, leak proof. There may be a slight plastic taste at beginning but will go away after several usages. REFLECTIVE STRIP FOR SAFETY: Decorated with reflective strip for safety especially when cycling in the evening. 2 FRONT POCKETS FOR CONVENIENCE: designed on straps for carrying keys, cellphone(less than 5" size, so not available for iPhone 6 plus). DURABLE AND COMFORTABLE MATERIAL: water resistance anti-scratch polyester fabric, breathable mesh on back side for sweat evaporation. SPARE PART: A backup bite valve for replacing, a clip for tube hanging and a tube cover for protecting from sunshine and cold.