Flip Tite Canisters feature an easy open and close ring that allows you to open and close securely with 2 fingers. Flip ring up to open and flip ring down to seal. They are made of a durable, shatterproof acrylic and a 100% silicone seal that makes them airtight. Clarity of canisters allows you to easily view what is inside. These stackable canisters are a great way to get your cabinets and pantry shelves organized and great for keeping your foods fresh. BPA free. Base of containers is top rack dishwasher safe.