Review on Nathan Women’s Hydration Pack/Running Vest - VaporHowe 4L 2.0: Perfect for Running, Marathon, Hiking, Outdoors, and Cycling with Twin 20 oz Soft Flasks Bottles! by Brett Morrison

This vest is amazing - much better than my old amphipod belt with the bottles that kept falling out. It holds 40 ounces in two non-spill Hydroflask containers. I haven't bought a 1.5 liter chamber that is also suitable for this, but I plan to. I've taken it for two long runs and it fits snugly and doesn't bounce. I bought the average size women's shirt I usually wear. I measured around my sternum and it was 34.5 inches; it fits perfectly. It's so comfortable I don't even know it's there and it fits my iPhone SE and Gel easily too.