Atmos Vacuum Canister

An airtight jar does not remove air, it keeps it. Whatever oxygen was in the canister when you last closed the lid stays in there working on the beans until you open it again. Fellow's Atmos takes the other approach and pumps the air back out.

The Atmos is a coffee canister with a vacuum pump built into the lid, so the air leaves the jar rather than being sealed in with the coffee. Twist the manual lid, or press the button on the electric one, and a small pump evacuates the canister until a window on the top shows the seal has locked. A separate release button breaks the vacuum when you want to brew. Vacuums leak slowly, which is why Fellow tells manual owners to twist the lid again every four or five days; the company's claim for a sealed canister is that coffee keeps twice as long.

The electric lid runs on a 3.7 volt, 2600 mAh lithium-ion cell, and its LED blinks red as the charge runs down. It refills over USB-C while the seal stays put, so the coffee is never exposed to charge the thing guarding it. One useful detail: that lid fits every Atmos body, so the 0.4, 0.7 and 1.2 litre canisters all take the same top, holding roughly 6, 11 and 16 ounces of whole beans respectively.

Whole beans are the only thing that should go in. Ground coffee clogs the intake valve and voids the warranty, and nothing here goes in the dishwasher.