MADE FROM HIGH DENSITY BLUE POLYPROPYLENE FOR A TOTAL CAPACITY OF 600 LBS. STACKS UP TO 4 HIGH FOR A TOTAL OF 2000 LBS. AND INCLUDES 4 FEET FOR STACKING. VENTED PANELS ALLOW LIGHT AIR AND SPRINKLER CIRCULATION. FEET ALSO ALLOW 4-WAY FORKLIFT ACCESS. MEASURES 39-1/4""L X 31-1/2""W X 29""H OVERALL. BULK CONTAINERS ARE SHIPPED FLAT FOR REDUCED SHIPPING. POSTS AND PANELS ARE EASY-TO-ASSEMBLE TO BASE USING INCLUDED HARDWARE. FOR CONVENIENT MOBILITY THE RUGGED CASTER SET INCLUDES 4 CASTERS (2 SWIVEL AND 2 LOCKING) AND HOLDS UP TO 2000 LBS.