Designed with kid-friendly， easy-open lids， therefore， not leak-proof; avoid liquids or runny food; for children， teens， and adultsLid fit is snug， not tight; great for people with special needs， allergies， picky eaters; make your own healthy "Lunchabless"; pack leftovers tonight for a fresh lunch tomorrowGreat for portion control or special diet; keeps food separated; safe for microwave， freezer， dishwasher; these food storage containers nest together to save space when not in use