nippr,
When I bought mine and installed it I found I needed two hands to remove it to empty without comprising the shape. I fabricated a small handle that allowed me to pull straight with one hand and minimize wear on the attaching clip.
Still a slight bump would distort the shape. I wanted to keep the shape when installing, removing and using. By moving the bag around all the time you run the risk of wearing the corners out.
I used a piece of cardboard and lined the inside and then lined the inside of the cardboard. Now it holds it's shape, works good and is ( as Freddy Prince would say) "LOOKING GOOD"