Every question, answered.

That's the terrain it's built for. The wide flexible base spreads across the cushion instead of pressing into one spot, and the fins keep the drink from sliding loose when the couch jostles at a jump scare. Bump it off level and it settles back.

This doesn't ask the armrest to be flat at all. It sits on the cushion, the blanket over your lap, or the ottoman lid instead, so a crowned or pillow-top arm stops being the problem it is for clip-on trays.

Then there's nothing to clip to and nothing to reach for. It sits directly on the cushion or blanket beside you, so the missing side table stops mattering.

Measure the bottom, not the rim. A base 2 to 3 inches across settles in — the 40 oz Stanley fits. Handled mugs don't; the handle sits where a fin needs to grip.

It's not on the floor to begin with. It's on the cushion, the arm, or the blanket you're already touching, right where your hand already is, not down on the carpet where a glass disappears.

That's the exact motion the fins are built to shrug off — they hold the drink's base and it resists tipping when the couch flinches. It's not invincible, so a direct hard knock is still a direct hard knock, but a startled couch is what this is for.

Yes — uneven, moving ground is where this holds up best, grass included. It plants on damp lawn the same way it plants on a cushion, so the projector setup on the grass gets the same steady base as the couch does.

No. Nothing clips, clamps, or attaches to anything. It sits on top of the cushion, the arm, the blanket, or the ottoman lid, and it tucks into a drawer between movie nights.

It's called the Steadi, molded in small runs in Orange, California by Steadi Labs. Every order ships free from steadilabs.com, with 30 days to change your mind.

The fins actually flex a little past the fully-guaranteed 3-inch ceiling, up to about 3.15 inches for a snug fit that seats with a push. That's why both popular Stanley tumblers work: the 40 oz H2.0 FlowState Quencher runs about 3.1 inches at the base and the 30 oz version runs about 3.15 — both land right at that flex edge, snug rather than loose. Wider than that is an honest no; the fins won't close around it.

It's close to the edge but still inside the range. A standard 12 oz can runs about 2.6 inches across the base; the slim 'sleek' format most hard seltzers use runs about 2.25 inches — narrower, on the same can height, which makes it the tippiest common can at movie night. It's still above the 2-inch floor, so it settles in the same as a standard can; it's just the one worth actually running through the sticky-note test if you want to see the margin for yourself instead of taking it on faith.

One per drink, basically. Each person's base sits on the cushion or blanket next to them, not shared or passed around, so a sectional full of people watching together just means a base at each seat instead of everyone eyeing the one spot on the coffee table nobody can actually reach.

No. A standard microwave bag pops to roughly 10 to 12 cups, and that bowl is already claiming laps and hands for most of the runtime. The base sits on the cushion or the blanket beside that, not under it or competing for the same lap space, so the two don't fight for room.

It's a solid molded base, not fabric, so it doesn't hold a stain the way carpet or upholstery does — rinse or wipe it off. The bigger point is what it's built to prevent in the first place: red-wine-out-of-carpet and soda-out-of-upholstery are common enough searches that whole cleaning-guide genres exist for them, and the honest goal here is keeping the drink off the couch and the rug to begin with.

Yes, for a mug without a handle, or a camp cup, within the 2 to 3 inch base range — the fins grip the same way regardless of what's in the cup. A mug with a handle is the one real exception on this list: the base itself would fit, but the handle sits exactly where a fin needs to close around it.

That's really the same physics as any other couch-wide jolt: the base holds the drink at the bottom inch instead of leaving it to balance on its own, so a bump to the cushion doesn't automatically send it over. It's not indestructible — a kid's hand landing directly on a full cup is still going to spill it — but the ordinary bumps of a house with kids and pets in it are inside what this is built for.

It's injection molded plastic, built to flex and spring back the way a fin is supposed to, not compress and stay flattened the way a foam pad does over time. Regular handling across ordinary movie nights — sitting, moving, tucking it in a drawer between showings — is what it's designed for.

It's the kind of thing most movie-night regulars have quietly worked around for years without ever naming the problem out loud — small enough to tuck in a stocking or a drawer, specific enough that the person who's always hunting for their cup on the floor in the dark will get exactly what it's for the first time they use it.