AIR AND WATERTIGHT - Four side locking system and hollow-centre silicone seal for superior airtight lockage. This airtight container is durable and will last for years to come. FREEZER AND MICROWAVE SAFE - Plan and freeze your meals or leftovers for later. Use this plastic container in the microwave to reheat your delicious lunch or dinner in a few minutes. DISHWASHER SAFE - For complete convenience, this batch cooking containers is completely dishwasher safe, meaning you will save time cleaning up every day. SPACE EFFICIENCY - This food containers with lids is designed to stack different sized containers on top of one another, allowing up to 40% more storage space in the fridge or cupboards. BPA FREE - Your safety is our priority. These meal prep containers with lids are BPA free and friendly to the body using superior durable and heat resistant raw materials