Our Happy Moose Ultra light running vest comes with 5.5 liters of storage. In addition to being lightweight, it is moisture wicking, vented and has breathable shoulder straps for comfort. The front and side straps make for easy adjusting. The vest includes pockets & zippered storage for phones and gear. The reflective logo and strips on front and back improve your visibility on those dusk and night time adventures. Comes with a1.5L Taste-Free, BPA and PVC Free Happy Moose water bladder and a whistle. One size fits most. Vest weights 8 oz. without water bladder. Front pockets designed to work with Happy Moose water flasks (not included).