Abstract: A foldable holder for flexible trash bags, the holder having planar sections which are connected to one another along adjacent edges so as to form a closed or tubular body. The preferred material for the planar sections or panels is corrugated paperboard (i.e., "cardboard"). The preferred configuration includes four connected panels which are sized to create a square-shaped holder when the panels are moved to their fully expanded condition. Two opposite panels are scored vertically along their mid-regions so that they may be folded internally until they touch--or nearly touch, thereby allowing the other two sides to be brought together in a parallel fashion. The collapsed mode for the holder (wherein the holder constitutes only about 5% of its expanded mode) constitutes a handy storage condition for the holder, so that it might be tucked behind an appliance such as a stove or hung in a closet when it is not in use.