These Vollrath plastic containers are great for storing food in low - temperature environments. To use them, simply open the lid, put your food inside, and close the lid tightly. When it comes to cleaning, you can wash them with warm, soapy water. Avoid using abrasive cleaners as they may scratch the containers. For storage, stack them neatly to save space. Also, remember that the item you get might not look exactly like the picture. And since they're from an open box, check them carefully upon arrival.