about 6 or 7 years ago, Ohioboy picked up this coolerbag at Sam's - it's about 3 feet wide by 2 feet deep. We didn't use it for years (and I personally thought it was really a stupid buy), but a couple of years ago on one of our visits I discovered it fits really great in the golf cart shopping bag, so now when I go shopping by golf cart, it goes in first. It's almost flat when it's empty (well, about 4 inches thick - has pretty good insulation).
Works great; I no longer think it's stupid