BUILD TO LAST: Thanks for our clients’ feedback, we improved the LIDS which are made up of High Impact Resistant and Durable ABS plastic. It won’t crack or break. With this improved design, our food storage containers will last for years. Made of BPA-Free and Food Grade plastic, Modular stacking system for optimal countertop and pantry organization. 
SECURE SEALING: Each canister features an airtight locking system resulting in a watertight and airtight seal. The container set is the perfect food storage solution for keeping ingredients and food fresh, dry and completely sealed. Once the ring on the lid is pushed down, the silicone seal inside the lid will expand to seal the jar, creating complete airtightness. Pop the ring back up and it serves as a handle to lift the lid. 
GREAT VALUE 7 AIRTIGHT FOOD STORAGE CONTAINERS: Each size is perfectly to store common household staples including cereal, flour, sugar, pasta, rice, coffee, nuts, snacks and more. Includes 1 Large Container(1.9L), 2 Medium Containers(1.2L), 2 Small Containers(0.8L), 2 Mini Containers(0.5L). With extra 12 reusable chalkboard labels and a marker, you'll never confuse sugar with salt again! 
EASY TO CLEAN: Simply remove the silicone attached along the lids of each container and wash with soap and rinse with water. Wrap the silicone around the lid again and seal back up to use again. Hand washing recommended; not recommended for dishwasher or microwave.