A plastic lid (24, 54) for large commercial and industrial solid waste containers, comprising: a central area (30, 60) of said lid having a single wall with a plurality of raised ribs (32, 62) spaced apart by intervening wells (33, 63); front, rear and two side perimeter edges (28, 35, 34, 36, 29; 58, 64, 66, 59) connected integrally to said central area (30, 60), said front, rear and two side perimeter edges (28, 35, 34, 36, 29; 58, 64, 66, 59) having a substantially hollow double wall cross-sectional configuration; a plurality of hinge lugs (26, 56) along the rear perimeter edge (34, 64), said hinge lugs (26, 56) including a plurality of relatively thicker tubular portions (37, 67), and said plurality of relatively thicker tubular portions (37, 67) being connected to said rear perimeter edge (34, 64); said lid being substantially symmetrical for permitting alternate stacking with similar lids (24, 54) with adjacent lids facing in opposite directions; and the front edge (28, 58) of said lid being shaped to provide vertical clearance for said hinge lugs on said rear edge when the lid is stacked with edges of adjacent lids being in engagement and adjacent lids being reversed in orientation; whereby said similar lids (24, 54) may be stacked with the vertical height of the stack being equal to the number of lids multiplied by the thickness of said front, rear and two side perimeter edges (28, 35, 34, 36, 29, 58, 64, 66, 59), plus the height of the ribs of one lid above said front, rear and two side perimeter edges (28, 35, 34, 36, 29, 58, 64, 66, 59) thereof, the plastic lid being characterized by: said relatively thicker tubular portions (37, 67) being connected together by relatively thinner or recessed tubular web portions (38, 68), said relatively thinner or recessed tunular web portions (38, 68) being spaced apart from said rear perimeter edge (34, 64). a central area (30, 60) of said lid having a single wall with a plurality of raised ribs (32, 62) spaced apart by intervening wells (33, 63); front, rear and two side perimeter edges (28, 35, 34, 36, 29; 58, 64, 66, 59) connected integrally to said central area (30, 60), said front, rear and two side perimeter edges (28, 35, 34, 36, 29; 58, 64, 66, 59) having a substantially hollow double wall cross-sectional configuration; a plurality of hinge lugs (26, 56) along the rear perimeter edge (34, 64), said hinge lugs (26, 56) including a plurality of relatively thicker tubular portions (37, 67), and said plurality of relatively thicker tubular portions (37, 67) being connected to said rear perimeter edge (34, 64); said lid being substantially symmetrical for permitting alternate stacking with similar lids (24, 54) with adjacent lids facing in opposite directions; and the front edge (28, 58) of said lid being shaped to provide vertical clearance for said hinge lugs on said rear edge when the lid is stacked with edges of adjacent lids being in engagement and adjacent lids being reversed in orientation; whereby said similar lids (24, 54) may be stacked with the vertical height of the stack being equal to the number of lids multiplied by the thickness of said front, rear and two side perimeter edges (28, 35, 34, 36, 29, 58, 64, 66, 59), plus the height of the ribs of one lid above said front, rear and two side perimeter edges (28, 35, 34, 36, 29, 58, 64, 66, 59) thereof, the plastic lid being said relatively thicker tubular portions (37, 67) being connected together by relatively thinner or recessed tubular web portions (38, 68), said relatively thinner or recessed tunular web portions (38, 68) being spaced apart from said rear perimeter edge (34, 64).