Space bag hanger (for coats)?

My mom bought some space bags recently to store some of our family heirlooms. When I saw how good they worked, i tried one of them for myself. I then proceeded to buy some of my own. One of the bag I bought was a hang-able one. It's supposed to store coats and such. My question is does it have a weight rating? The way I figured it, the vacuum sealing can help hold the thing together so far. But, unless the plastic is durable enough to stand hanging from a plastic hook, it's gonna tear. So, does anyone have any idea what the recommended maximum amount of weight is that they suggest you put in the hanger bag?