●SIZE & CAPACITY: You will get a black cycling backpack and a 2L water bag. The size of the camel pack backpack is 40×30×8cm, with a compartment for storing a water bladder and a storage compartment, which can hold a tablet, mobile phone, wallet, glasses, etc., the large capacity easily meets your storage needs for outdoor cycling or running. ●WATERPROOF AND BREATHABLE MATERIAL: The running vest hydration is made of high-quality waterproof Oxford cloth, which is scratch-resistant and abrasion-resistant, and is not afraid of rainwater infiltration, so you can walk freely on rainy days. The shoulder straps and back are designed with mesh and sponge, breathable and comfortable, refusing to be stuffy. ●HELMET STORAGE/ REFLECTIVE DESIGN: Designed for cycling, this cycling hydration backpack comes with a mesh pocket storage bag at the bottom of the backpack, and you can store your helmet by connecting the hook above. The mtb backpack is also designed with high brightness reflective strips to ensure safer cycling and running at night. ●WITH 2L WATER BAG: Running vest with water bladder, PEVA water bag, no odour and no leakage. The water backpack fits easily into the compartment of the cycling bag, and the straw can be fixed on the shoulder strap, allowing you to free your hands while cycling and easily hydrate anytime, anywhere. ●LARGE CAPACITY 2L WATER BLADDER: The water bladder is made of PEVA material, BPA free and safe for drinking. Wide opening for easy filling and cleaning. The bladder fits easily into the compartment of your bike backpack and the straw attaches to the shoulder strap of your backpack, allowing you to free your hands while riding and hydrate easily anytime, anywhere.