Reviewed by William Dowling - 8th Jun, 2020 Small Bought in store. Double checked the size on the label which says “OS” which I assume is one size. I’m 5’9” and found my feet were pressed against the bottom with my head tucked inside the hood. Possibly the smallest, narrowest adult sleeping bag I’ve owned. Thick and other than being small was comfortable and warm. First time used the filling started to come out of the drawstring holes when tightening the hood but managed to stuff back inside with a thin twig!