Usage Tips:1. PP material has no bad ingredients, so it is safe to use. And the hardness is good enough to protect your sandwich. It is also corrosion-resistant, and the juice on the food you bring has no effect on it.2.These food storage containers are also microwaveable and dishwasher safe. When you're ready to enjoy your food, you can put it in the microwave to heat it up.3.It has a simple snaps-on lid for easy opening and closing. Our sandwich box can also be heated in the microwave, so you can quickly eat a hot lunch.4.Our sandwich keeper allows you to put a few sandwiches in, or put some fruits and vegetables between two sandwiches. 5.Shaped like bread so they fit your sandwiches perfectly for lunch, dinner, meal prep, or picnics. You can also put fruit, vegetables, dessert, candy, snacks in your lunchbox.