Wide Opening: 4-Inch wide opening of the bladder ensures easy refilling, adding ice cubes, cleaning and drying. The smooth inner wall provides a healthy and fresh drinking experience Detachable Drinking Tube with Insulated Cover: For better cleaning and drying, the tube is designed to be detachable and quick- release. T is an insulated cover to resist temperature changes of your water during different weather conditions and dust cover to keep dirt out of your mouthpiece. BPA-FREE & Odorless: Made of food-grade material. Tasteless when you drinking water. With the endurance temperature of -20~50 ?, this bladder works great in different kinds of outdoor adventures through four seasons. Most Functional Cleaning Kit: Effectively clean your hydration bladder, water reservoir or water bottles, No more dirt. 4 in 1 cleaner pack including three brushes and a foldable support frame. Leak- Proof with ON/OFF Valve: With easily accessible on/ off valve, the silicone mouthpiece is leak- proof and easy to such water. The bladder is super durable due to its pressure- tested good sealing performance.