An embodiment of a box is configured to be transformed to include a tapered structure configured such that when the transformed box is inserted into the receptacle, the tapered structure provides a universal fit. An embodiment of an extender is formed by steps including providing a single piece of material having a first edge and a second edge and forming, by cutting the single piece of material, at least one top extension extending from at least one wall and at least one bottom extension extending from the at least one wall such that the at least one top extension is foldable to abut the at least one wall. A method for collecting waste materials includes providing a receptacle and a box, and disrupting the extender. An embodiment of an extender comprises a first wall, a second wall, a third wall, and a fourth wall.