Most Popular Soft Tonneau
There are quite a few soft tonneau covers on the market today. These truck bed covers come with various sealing systems to keep them closed. Some snap up, some tonneau cover manufacturers use velcro to seal it closed and others use a seal and peel system that pushes into a groove to seal it, something like a zip lock bag.
A personal favorite and a most popular favorite soft tonneau cover by truck owners is the Trifect tonneau cover made by Extang. This is a folding soft truck bed cover that makes getting in and out of your cargo area as easy as it can get. The cover is so easy to install a kid could do it. It comes fully assembled and with a few quick clamps that are supplied the cover is on your truck in a few minutes and that is no exageration.
Check out the Trifecta Tonneau cover at http://www.TruckBedTonneau.com