Airscape vs MiiR Airlock: which canister (September 2026)

Here is the short answer. Buy the Airscape if you drink whole beans, finish a bag inside a few weeks, and want a plunger you press once and forget. Buy the MiiR Airlock if you also store grounds, or you want the 2025-2026 push-knob stopper sized to a 12 ounce bag. Price will not pick for you. Planetary Design lists the Classic from about $34, with the one-pound around $38.^[1] MiiR lists the Airlock at $40.^[2] What splits them is grounds, size range, and how the inner lid actually works.

If you landed here first: we already ran the vacuum fight in our Airscape vs Fellow Atmos head-to-head, and the Airscape took the overall slot in the coffee storage canister roundup. This piece is the other comparison, the one a vacuum jar cannot win. Fellow tells you the Atmos is whole beans only, because powder clogs the intake valve.^[3] Displacement canisters do not have that valve, so both of these can hold beans and grounds. We did not run a lab. Specs come from the makers. Cup notes on the Airlock come from Serious Eats, which reviewed the 2025-2026 push-knob redo.

The Airscape, from Planetary Design, is the plunger classic. Stainless steel body, two-part lid. Drop the inner lid onto the coffee, press, and air hisses out through a valve until the plunger sits on the beans. A second lid caps the rim. Because the plunger rests wherever the coffee is, the seal keeps working as the jar empties.^[4] The Classic comes in 250 grams (about a half pound) and 500 grams (about a pound), roughly 5 inches across, about 4 inches tall for the small and 7 for the medium.^[5] The larger Kilo, $49, is listed for up to 2.5 pounds of whole beans if you buy bulk.^[6] Planetary Design also sells the Airscape for ground coffee and other dry goods, and it sells replacement inner lids, gaskets, and top lids, so a worn seal does not kill the canister.^[7]Care is a hand wash. Steel blocks light, which is coffee's other enemy. A glass body exists if you want the look; keep that off a sunny counter.

The MiiR Airlock is the 2025-2026 redo of MiiR's coffee canister. In October 2025 MiiR announced an updated Airlock with an easy-press inner seal.^[8] By February 2026 Serious Eats was testing the push-knob version: beans or grounds in, silicone stopper on top, push it down, then the outer lid.^[9]Pull the knob to release. One size, listed for a standard 12 ounce bag of beans or grounds. Opaque 18/8 stainless. Hand wash, no freezer, no microwave. Serious Eats came back to it as a daily canister that works for beans and grounds, at about $40. The Airlock's job is the daily bag, including grounds a vacuum jar should not touch.

Honest tradeoffs, without pretending these are vacuum pumps. Both push headspace air out. Neither drops the pressure the way an Atmos twist does. Serious Eats' ten-day tasting preferred vacuum for whole beans. A large Airscape they tried (over two pounds, bulky on the counter) did not win that cupping. The older accordion-and-switch MiiR was worse: a pain to flip, and the cups did not help. The new Airlock was the displacement jar they actually liked, and their 2026 roundup names it the pick for pre-ground. Bright for well over a week, a bit flat by day ten. They list it at about 4 inches across and a little over 6 inches tall, and they note the outer lid sits loosely, so lift from the body. The stopper is the seal.^[10] That is useful. It is not a reason to skip the Classic if you finish a 12 ounce bag before then. The Airscape still wins on SKUs: half pound, pound, kilo, and parts you can reorder. The Airlock wins on the grounds use-case and on a lid you push by the knob instead of fishing a plunger off the bottom.

Match the canister to how you buy, not to a spec-sheet vacuum number. If you grind to order and kill a 12 ounce bag inside two or three weeks, the one-pound Airscape Classic is enough hardware, and the money you keep buys better beans. If you sometimes keep pre-ground, or you want a compact 12 ounce footprint with the new stopper, the Airlock is the one Serious Eats would hand you. If a bag lasts a month and it is whole beans only, that is still the Atmos conversation, not this one. Opaque over clear either way. Both sit on our gear page next to grinders and kettles, and the method lives in how to store coffee beans, including the freezer question a plunger cannot answer.

One last point that outranks the hardware. A canister protects freshness. It cannot create it. Start from beans roasted recently and nearby. Sey in Bushwick and Devoción in Williamsburg both roast what they sell. A burr grinder still does more for the cup than either lid. Buy the fresh bag, move it into whichever of these two fits how you actually drink, and either displacement jar will hold the head start you paid for.