VestPac is a lightweight minimalist hydration pack designed to provide the best performance in every situation. VestPacs are designed to carry all of your essential gear in a way that's completely balanced and easy to access. Both front and back are constructed of our patented 3D Airmesh for sweat-eliminating climate control. The elastic straps adjust to provide a secure fit for all sizes, ensuring the VestPac never bounces or rubs. In other words, no distractions keeping you from enjoying Mother Nature the way you want to.