Stay hydrated on your outdoor adventures with the ingenious Aonijie 500ml Quick Stow Soft Flask. It features an adjustable mouthpiece for ease of use, dual caps design for efficiency, as well as a BPA-friendly PP cap. It can resist frost and high temperatures from  0°C to 40°C and the antibacterial TPU is much safer to use than alternative materials and it comes in a convenient foldable format.