Product Description: General Material: 304 Stainless Steel Capacity: 18 OZ Gross Weight: 0.5kg Package Include: 1x Canister +1xBonus Scoop(0.45oz) What is the interior capacity for storage? It can store up to 18 ounce of whole or ground coffee. How big is the added scoop? The bonus scoop hold a dose of 0.46oz coffee. Does it really air tight? 304 Stainless Steel Quality Material with Reliable Construction: Screw-on lid with unique airtight silicone seal applied to preserve freshness of whole, roasted beans and ground coffee day in day out. Is the inside stainless steel as well? Or is it plastic inside the container? The inside of the whole container is stainless and the inside of the lid is plastic to line up with the air tight seal plastic part that is at the top rim of the container only. Can it be used to store other things beside coffee Surely it can. Not just coffee, this canister can also be used for keeping tea, sugar, salt, spice and other fresh ingredients. An Ideal food saver and storage container for household or travel use. More confusions about the Easehold Coffee Canister, please feel free to contact with us by asking a question below , our customer service will be with you before ,during or after purchase .