INNOVATIVE & PATENTED PLUNGER DESIGN - The patented inner plunger lid with a two way valve forces excess oxygen out of the canister and locks out excess humidity. Preserving freshness MUCH longer than typical airtight containers. The stainless steel canister blocks harmful UV rays from harming your coffee beans. We don’t recommend windows in coffee storage vessels due to harmful UV rays. SOUND OF FRESH - Airscape lid removes all air in the canister creating airless food storage; extends the life of coffee, tea, flour, sugar, cereal, cookies, seeds, herbs, nuts, pet food or any perishable goods. The “swoosh” sound lets you know it’s working COFFEE CONNOISSEUR - Proper storage to preserve the integrity and quality of the whole coffee bean, extending the coffees' body & flavor profile for an exquisitely crafted cup of artisan brew. Resists staining & odor transfer QUALITY COUNTS - Airscape Coffee & Food Storage Canister made from 18/8 restaurant-grade stainless steel, BPA-Free components with an enamel paint finish. Multiple colors available to add a pop of color to your kitchen. Hand-wash only STURDY & STACKABLE - A perfect size for your kitchen counter or easy to stack for compact storage in the pantry. Medium holds approx. 1 lb (500 g) of whole bean coffee [dimensions 5"w x 7"h]; Small holds approx. 1/2 lb (250 g) of whole bean coffee [dimensions 5"w x 4"h] INNOVATIVE & PATENTED PLUNGER DESIGN - The patented inner plunger lid with a two way valve forces excess oxygen out of the canister and locks out excess humidity. Preserving freshness MUCH longer than typical airtight containers. The stainless steel canister blocks harmful UV rays from harming your coffee beans. We don’t recommend windows in coffee storage vessels due to harmful UV rays.