Vertical 4L Plus is a lightweight hydration backpack designed for the performance minded, multi-sport enthusiast who needs 4L of storage capacity to carry personal gear and hydration. Equipped with soft mesh, highly ventilated shoulder and chest straps and built on our award winning NDM 4-point harness system, the Vertical 4L Plus offers the best fit available in the market. Inside the main compartment there are several pockets for your gear and first-aid kit, and a 2L Hydrapak Elite hydration bladder with Slide-Seal top and Plug-N-Play coupling for easier handling.