... due to the picture not giving much in the way of measurable comparison (like a cooler or your arm/body).
And ... I wouldn't discount it as a wallhanger !!
I'd venture to say it's in the 6-8 pound range ... based on the fact that it looks as though your fist would fill its open mouth -- and my fist fills up the mouth of my 7lb wallhanger :p (my fist is 4" wide)
... cp