A system for encasing material in one of a stretchable bag and a shrinkable bag, comprising: a frame; a first pivot (316; 516) mounted to said frame and projecting perpendicular to a plane; a second pivot (318; 518) mounted to said frame and spaced apart from said first pivot, the second pivot projecting perpendicular to said plane; a first product horn (304; 504) mounted to said frame on said first pivot and a second product horn (306; 506) mounted to said frame on said second pivot, each said product horn having an arcuate shape curving away from the other said product horn, each said product horn having a proximal portion (320; 520a, 520b) and a distal portion (322; 522a, 522b), said proximal portion being angled relative to said distal portion such that a vertex is defined between said portions, said product horns (304, 306; 504, 506) are attached to said pivots (316, 318; 516, 518) in the region of the respective vertex, said product horns each rotatable about each said respective pivot in said plane from a first position in which distal portions of said product horns are adjacent and said proximal portions are remote to a second position in which said distal portions of said product horns are remote and said proximal portions are adjacent; a pair of air cylinders (324, 326; 524, 526) for pivoting said first and second product horns (304, 306; 504, 506) between said first position and said second position; a stretchable-bag system, comprising a bag carriage unit (310; 510) movable in a direction perpendicular to said plane, from a first vertical position remote from said product to a second vertical position adjacent to said product horns (304, 306; 504, 506); a shrinkable-bag system, comprising a pair of pulling rollers (350; 550) mounted under said product horns (304, 306; 504, 506), a collection roller (362; 562) mounted adjacent said pulling rollers (350; 550), and an incremental advance device (366; 566); a product ram (302; 502) configured to move material from a first ram position distal to said first product horn (304; 504) and said second product horn (306; 506), to a second ram position between said first product horn and said second product horn, to a third ram position proximal to said first product horn and said second product horn; an air jet (308; 508) mounted below said product horns, an electronic controller configured to control at least said bag carriage unit (310; 510)and said incremental advance device (366; 566); and a switch to cause said electronic controller to toggle between an operation using the stretchable-bag system and an operation using the shrinkable-bag system. a frame; a first pivot (316; 516) mounted to said frame and projecting perpendicular to a plane; a second pivot (318; 518) mounted to said frame and spaced apart from said first pivot, the second pivot projecting perpendicular to said plane; a first product horn (304; 504) mounted to said frame on said first pivot and a second product horn (306; 506) mounted to said frame on said second pivot, each said product horn having an arcuate shape curving away from the other said product horn, each said product horn having a proximal portion (320; 520a, 520b) and a distal portion (322; 522a, 522b), said proximal portion being angled relative to said distal portion such that a vertex is defined between said portions, said product horns (304, 306; 504, 506) are attached to said pivots (316, 318; 516, 518) in the region of the respective vertex, said product horns each rotatable about each said respective pivot in said plane from a first position in which distal portions of said product horns are adjacent and said proximal portions are remote to a second position in which said distal portions of said product horns are remote and said proximal portions are adjacent; a pair of air cylinders (324, 326; 524, 526) for pivoting said first and second product horns (304, 306; 504, 506) between said first position and said second position; a stretchable-bag system, comprising a bag carriage unit (310; 510) movable in a direction perpendicular to said plane, from a first vertical position remote from said product to a second vertical position adjacent to said product horns (304, 306; 504, 506); a shrinkable-bag system, comprising a pair of pulling rollers (350; 550) mounted under said product horns (304, 306; 504, 506), a collection roller (362; 562) mounted adjacent said pulling rollers (350; 550), and an incremental advance device (366; 566); a product ram (302; 502) configured to move material from a first ram position distal to said first product horn (304; 504) and said second product horn (306; 506), to a second ram position between said first product horn and said second product horn, to a third ram position proximal to said first product horn and said second product horn; an air jet (308; 508) mounted below said product horns, an electronic controller configured to control at least said bag carriage unit (310; 510)and said incremental advance device (366; 566); and a switch to cause said electronic controller to toggle between an operation using the stretchable-bag system and an operation using the shrinkable-bag system.