An extender formed from at least one flat piece of material that has straight edges, that includes a body structure formed by attaching a first edge of the at least one flat piece of material to a second, opposing edge thereof. The body structure includes a wall defining an interior space extending therethrough and at least one dynamic portion configured to be manipulated to create a first fold portion and a second fold portion that inwardly extend into the interior space. The body structure is configured to be inserted into a garbage can to extend a capacity of the garbage can. As the body structure is further inserted into the garbage can, the at least one dynamic portion facilitates a change in shape of the wall so that at least a portion of the wall becomes more tapered the further the body structure is inserted into the garbage can.