There is a metal strip that I have seen for sale in Drag Spec, or JP cycles for about 20 buck, which lays across the top and keeps the hoods from sagging out of shape. I just replaced my bags due to that, and made my own strips from some aluminum from home depot wrapped with black electrical tape. They work !! You just pull them up when you need to get in the bag, and put them back, they really stabilize the top. Put a little bow in the top so that it forms to the shape of the top. Seems to be a problem with all those bags.