Blue Osprey Duro LT hydration vest Size M I am a women size XS/S and this one was too big for me. I think it is a Mens Medium. It has a lot of adjustable straps but it would fit better for a size M maybe even L. Super lightweight, fits 2 bottles + phone zipper pocket + pockets for snacks and a handy back pocket for snacks or small clothing. Some signs of wear (see photos) but it is al esthetic no functional problems. Ready for a new runner! #hiking #outdoors #trailrunning