MIRACOL CUSTOMER SERVICE: If you are not satisfied with the backpack you purchased, please feel free to contact us. Satisfactory solution will be given within 24 hours. Included 2L Water Bladder: Made from EVA material, BPA free, tasteless. Extra large 3 inches opening for easy cleaning and ice filling. Removable hose tube with quick shutoff valve, on/off silicone bite valve, dust cover and insulated tube cloth. Quick Access Front Pocket: The front pocket can put small items like snack, towel, headphones, sunglasses, etc. Concise design reduces your burden, and it is convenient for you to get the item on the way. Thermal Insulated Compartment: The main compartment is covered with a high quality aluminum foil layer, which keeps your liquid cool up to 4 hours. Unique thermal insulation design allows you to enjoy cool water during the journey. Lightweight & Snug Fit: The weight of the backpack is only 0.79 pounds, lightweight and compact make you feel more comfortable. It's perfect for outdoor activities, such as running, cycling, day hiking and music festival. nylon.