Featuring a dual steam valve and date-dial on the lid this set make it easy to keep track of food storage in the fridge or freezer. The containers also feature a locking system making these boxes reliably 100% leakproof. This set is made from dishwasher safe long-lasting non-toxic BPA free plastic so you can be reassured that no nasty chemicals will be transferred to your food and that the plastic used is sustainably sourced. This set includes heat resistant wings that stay cool when you remove it from the microwave. This set includes 2 x 650ml, 1 x 950ml, 1 x 1250ml containers.