The redesigned Nano Vest is the preferred choice of Trail and Ultra runners looking for a minimal run vest. Updates include a lighter more minimal dual sternum strap attachment system that has integrated reflectivity, a removable safety whistle and a new 3D Micro Mesh that is lighter and more breathable. The new Nano offers a pack-only weight of less than 140g and includes two best-in-class 500ml/17oz Quick Stow flasks. The updated 3D Micro Mesh enhances air flow and breathability while still offering great cushioning for added comfort and it comes in multiple sizes to ensure a personalized fit. It maintains the same streamlined gear organization you love, including 2L gear capacity for secure phone storage, several stretch overflow pockets and it's signature trekking pole carry for accessing poles while running.