Reinforced top and bottom corners on both box and lid help prevent chipping and cracking; easy-grip handles have structural rib reinforcement to provide extra support for heavy loads; dishwasher safe; NSF Listed; 12" x 18" box has side capacity indicators for quick inventory checks; perfect for "prepping" and "portioning" of foods; quart gallon and liter capacity indicators (on 12" x 18" box) offer portion control for both domestic and international use; stopples Boxes and Lids' date indicator helps promote organized food storage makes inventory checks quick and easy; all sizes stack for easy efficient storage; fit standard carts and racks; smooth interior surface makes cleaning easy; use everyday to organize and inventory kitchen supplies and equipment; stacks with other boxes on the market; use in catering for storage and transporting of foods beverages linens and supplies; serve and display ice and iced beverages; boxes double as dough proofing bus boxes ware washing tubs for kitchen overflow or remote locations; "Lock-Tight" lids can be reversed and used as bun pan or tray; 18" x 26" colander is ideal for storing draining thawing and marinating foods; keeps lettuce crisp thaws and drains fish on ice marinates chicken etc.; colander fits 18" x 26" x 6" or deeper boxes; Clear polycarbonate provides easy visibility superior resistance to food acids and oils and withstands temperatures from-40 Degree Fahrenheit to 212 Degree Fahrenheit ; NSF Listed as N10622-PC.