Made of safe POLYPROPYLENE these containers and lids are engineered for heat and cold resistance.It's thick walls keep cold items cold and hot items hot.Your freezer's best friend these containers are nestable making for a neat presentation that shows off your cooked foods in a frozen orderly display.The handy 1 cup size is ideal for single portion soups, stews, sauces, deli salads, and great for leftovers.They are easy to stack in coolers and picnic baskets and its New & Improved AIRTIGHT lid keeps delicate foods fresh! Great to use for assorted chips or fruits.Think outside the box! Also the perfect container for arts & crafts and fine motor toys.Use to divide crafts and paraphernalia in its compartments by colour or size.Hassle free woodworking & home repair - organise little wire nails or screws.CLEAR LID for easy viewing of contents.