The Adventure Vest 4.0 is the pack of choice for those looking for the most volume in the UD running vest lineup. This pack comes with one 500ml soft flask but carries a bladder well with a dedicated compartment. It allows for a lot of storage up from and along the sides in stretchy zip compartments. There are also two pouches on the back for quick access and storage. 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.