Beefed up and better, the 2011  Sumo Sacs are here. Made from the most flexible, puncture-resistant material available, a sandwiched, woven polyester core and have internally glued and taped seams for a nearly indestructible bag.  The sandwich construction keeps them thin, so they are easy to fold up andstore when not in use.  We spent a lot of time measuring different boats to make sure that these square bags will fit anywhere on any boat.