Nylon Imported No Peva 1.5l hydration bladder - our water bladder is made of bpa-free peva, with better softness and a little elasticity, can be filled with full water without warrying about leaking High quality hydration backpack: Made of premium nylon, more wear resistant and durable. Breathable fabrics on the back and shoulders ensure breathability and comfort, so you don't get stuffy while exercising Large capacity: Equipped with 5 pockets - 1 water bladder compartment, 2 water bottle pockets and 2 small bottom pockets, providing convenient storage. The drawstring system on the back also stores clothes More stable & perfect fit: The chest and waist adjustable buckle strap can be adjusted to a suitable size according to your body shape, and the back drawstring system will compress the items inside the backpack to reduce the shaking and resistance Multi-purpose: Our hydration vest are ideal for running, jogging, marathon, hiking, climbing, cycling, backpacking, traveling, riding, camping, trekking; one size fits for men, women and youth Stay hydrated and keep your essentials within reach with our lightweight and ergonomic Running Pack with Water Bottles. Designed for runners of all ages and genders, this hydration pack is perfect for staying refreshed during your workouts, races, and outdoor adventures.