Gorilla tape is heavy-duty tape that is tougher than the average duct tape. It works really well under different situations.
You can indeed store ice in a backpack cooler. However, in order to do so, you have to take care of a few things. First, make sure that you put ice in when the backpack is perfectly chilled. Also, always keep ice on the top of foods in the cooler. You can also pack the ice in sealed boxes or plastic packs to sustain it longer.