Abstract: A material debagging apparatus includes a receptacle movable between upright loading and inverted dumping positions. The receptacle defines a bagged material holding chamber with a closed bottom and an open top. A rupturing mechanism in the form of a pair of generally parallel drums having circumferential rows of teeth thereon is carried on the receptacle adjacent the closed bottom of the chamber. The rupturing mechanism is operable for rupturing a bag at least partially filled with material and disposed in the chamber with the bottom of the bag overlying the rupturing mechanism. A clamping device is mounted on the receptacle adjacent the open top of the chamber for clamping and securing the top of the bag while the bottom of the bag is ruptured by the rupturing mechanism. The clamping device includes a pair of clamp members positioned side-by-side and normally urged into a clamping condition by a spring.