The Mountain Vest 4.0 13L pack is the pack of choice for men who want a trail running vest that has extra room for essentials for bigger objectives. It's designed to carry two 500ml soft flasks up front and with multiple zip pockets to safely store other items. There's a back compartment for extra layers and gear as well. It is made from stretchy and breathable materials like the other packs in the Vest/Vesta series, and UD paid attention to detail to give you the best fit possible.
Fit: SM: 23-32 in // MD: 30-39 in // LG: 37 - 46 in
Measure around bottom ribs for the best fit.