A flexible base that holds the can, the bottle, or the 40 oz tumbler steady on vinyl benches and a moving deck. It comes aboard in the tote bag, attaches to nothing, and the boat goes back at five exactly as you found it.
See it at steadilabs.com →Free shipping · 30 days to change your mind · Molded in small runs in Orange, California
Will your cup fit? Grab a sticky note — the 10-second test ↓
The situation
Nobody on this boat owns it. The layout is a surprise until you're standing on the dock, the deposit signature is still fresh, and the handful of molded cup holders fills with phones, keys, and sunscreen before the first can is even open. Every drink after that improvises.
A boat rated for eight to eleven people ships with a few recessed rings about 3.5 inches across — sized for a bare 12 oz can, in the era of the 40 oz tumbler. Whatever the phones and the sunscreen don't claim, the one cup that actually seats does.
Marine vinyl over foam, hinged over a storage locker, worn loose by a season of renters. The foam dips when the can goes down and springs back when your neighbor stands up — and by mid-morning the vinyl is slick with spray, sunscreen, and can-sweat. The first broadside roller takes whatever was parked there.
The fencing ends in a flat aluminum cap an inch or so wide — the instinctive shelf for anyone standing at the rail, with open lake on the far side. A drink that tips inboard is a mess. A drink that tips outboard is gone.
The flattest, most central surface aboard, which makes it the day's de facto side table — except it's domed, filmed with meltwater, and it opens every few minutes for the next round. A drink parked there lives round to round.
One small top on a single stem, shared by the whole crew, and it amplifies every roll. One pontoon-forum account describes a passing cruiser's wake putting everything on the table straight into the water.
None of this ruins the day. It just runs underneath it the whole time: a boatload of drinks improvising around a deck that has to go back spotless at five.
You know the moment
Safety briefing, the no-glass reminder, a signature on the deposit form, and the cooler hauled down the dock and wedged into the playpen. The first cans crack while you're still idling through the no-wake zone — and the molded holders are already spoken for.
The throttle comes up for the first time, the bow rises, and every can standing loose on the deck slides aft at once. The whole crew learns the boat's first lesson inside thirty seconds of real speed.
Anchored, half the crew floating off the swim ladder, drinks lined along the rail top and the table. A cruiser passes on plane a hundred yards out, its wake rolls in broadside, and the boat rocks rail to rail. The drinks nobody was holding go over — some onto the deck, a few into the lake.
The captain sees a big set coming and calls it — grab your drinks — and eight hands claim eight drinks while the boat takes the wake at an angle. It works for every drink that has a hand. The ones parked on the table are the ones that end up on the floor.
Boat due back at five. Cans fished out from under the bench seats, trash bagged, someone scrubbing the ring where a soda dried on the vinyl — because the walkthrough is in ten minutes and cleaning fees come out of the deposit.
What you get
The wide flexible base spreads across a vinyl cushion or the deck instead of balancing on a point. A wake rolls through, the surface tilts, and the base flexes with it — the drink rocks, then settles back level.
Slim seltzers, 12 oz cans, the plastic water bottle, and the 30 and 40 oz tumblers the boat's own molded rings won't seat. Cans and bottles slide in through the fins; cups and tumblers drop in and get gripped by the bottom inch.
No screws, no clamps, no suction, no residue — one piece of flexible molded material that comes aboard in the tote with the towels and packs out the same way. The return walkthrough finds nothing to note.
The fit test
A square sticky note: 3 inches, exactly.
The classic square is exactly 3 inches on a side. That's a fact about sticky notes — and it happens to be the exact ceiling of what fits.
The tumbler headed for the cooler bag, the water bottle, a can from the fridge — or that same can in a koozie, since insulation adds width. The bottom decides it, not the rim.
Base lands inside the note? It fits. Hangs over the edges? Too wide. A little puck lost in the middle — under about 2 inches? Too narrow.
Ten seconds per cup, at home, the night before — so the only surprise at the dock is which boat you got.
Will it fit my cup
One line covers the whole cooler: a container base about 2 to 3 inches across settles in. Every verdict below follows from it.
There's a floor as well as a ceiling — under about 2 inches, a base sits too loose. Two cooler-specific notes: a koozie counts as part of the can, so run the test with it on. And the handled mug stays home — its base fits, but the handle lands right where a fin needs to grip.
How it works
A worn rental cushion dips under anything narrow and tips it. The wide flexible footprint lies across the vinyl — or the deck, or the cooler lid — instead of pressing a point into it.
Flexible fins hold the container from the sides by its bottom inch, so a throttle change or a wake crossing can't rattle it loose.
The boat rolls, the cushion shifts, somebody drops onto the bench beside it — the base flexes with the surface and brings the drink back level.
Know the playpen
The industry's own parts glossaries call a pontoon's fenced deck the playpen — a floating living room for up to eleven. What the glossaries skip: nearly every surface in it is vinyl, moving, or both.
Marine vinyl over foam, most of them hinged lids over storage lockers, worn loose by the fleet's season. Foam dips under a set-down can and springs back when a neighbor stands; wet vinyl offers almost no grip. A wide flexible base rides the cushion instead of point-loading it.
The only truly flat surface aboard — and it vibrates underway, collects drips from swimmers and the cooler, and carries the foot traffic of a double-digit headcount. A floor spill runs under the bench seats, exactly where a renter can't clean before the walkthrough.
One small removable top on a single stem, serving the whole crew and wobbling while it does. A stem is a lever: the table amplifies roll instead of absorbing it.
The fencing's flat cap is an inch or so wide, with open lake on the outboard side — clamp-on holders exist for this rail precisely because nothing balances on it. A rail-top drink that goes the wrong way isn't spilled; it's lost.
Flattest and most central, so it becomes the side table — but it's domed, ribbed, slicked with meltwater, and it opens every few minutes for the next round. Cans skate on it between openings.
The seats past the forward gate take the most vertical motion and the first spray when the nose slaps chop — and on many rental pontoons, it's also where the factory cup holders are scarcest.
Versus what you do now
Sold in rail-shape-specific versions — square-rail models don't fit round rails, and sizes vary by builder — so a renter doesn't learn whether theirs fits until standing on the boat. When it does fit, it serves exactly the people within reach of the fence, one holder per drinker, and the spring clamps take real hand strength to open.
The product guides are upfront: it needs a smooth, non-porous surface — gelcoat, glass, slick acrylic. Textured pontoon dash plastic defeats the vacuum, vinyl was out of the question from the start, and the smart-suction style is flagged as not designed for heavy 30-plus-ounce tumblers. The failure mode is a sudden full release.
Owner forums hunt for these because big tumblers won't seat in the roughly 3.5-inch molded rings. But an expander perches the container higher out of a shallow ring — it trades a fit problem for a top-heavier one.
Reviewers report it shifts when cushions fit loose — and a rental fleet's cushions are the loosest, most worn vinyl on the lake.
A koozie fixes temperature, not tipping — the can stays just as light and comes out slightly wider than the molded ring. The floating holder is honest about its job: it helps after the drink is already in the lake with you.
Before you buy
Moving, uneven surfaces are exactly what the shape is for. The wide base flexes with the deck or the cushion instead of fighting it, and the fins keep the drink from rattling loose through throttle changes and wake crossings. It resists tipping and settles back when the surface moves — and when the captain calls a big one, grabbing your drink is still good seamanship.
That tumbler is why the packing guides tell you to secure drinks underway — tall, heavy when full, standing free on flat surfaces. It fits, and it seats down into the fins and gets gripped by the bottom inch, which is the help a tall container needs. In real chop, give it the low seat anyway: deck floor over rail top.
It attaches nothing. No screws, no clamp, no suction, no adhesive — it sits on the bench, the deck, or the cooler lid, picks up in one grab, and goes home in the tote. The walkthrough finds the boat exactly as it left the dock.
The honest answer: it sinks — it doesn't float. Water itself is no problem at all — spray, cooler slush, a full dunk to rinse it off the swim ladder — but keep it inboard of the fencing, same as your phone.
A sweating can skates on wet vinyl because it touches the seat along one narrow ring. The base meets the cushion across its whole flexible footprint — a different conversation with a slick surface — and the drink inside is held by the fins, so it rides the boat's motion instead of skating with it.
It shapes the whole cooler — rental operators commonly ban glass on the water, which pushes the day into cans, plastic bottles, and insulated tumblers. Those are the lightest, tippiest containers aboard, on the slickest surfaces, and they're exactly what the base is sized for: bottoms about 2 to 3 inches across.
One per drink you want parked. Most crews would place a few — the table, each bench cluster, one up on the bow where the factory holders run thinnest — and since each is a flat piece of flexible material, several ride in the tote without claiming real space.
No — it doesn't go in a cup holder, and it isn't an expander. It makes the surfaces work instead. The molded rings will still be full of phones and sunscreen ten minutes out; this puts a place for a drink next to wherever you're actually sitting.
Rinse it over the side, hose it at the dock, or run it through the dishwasher at home. It's one piece of flexible material with no parts to come apart.
It's called the Steadi, injection molded in small runs in Orange, California by Steadi Labs — a small veteran-founded company, patent pending. Orders ship free from steadilabs.com, with 30 days to change your mind.
Who makes it
The maker is Steadi Labs, a small veteran-founded company in Orange, California. It's injection molded — the mold, the material, and the color runs all sit within about three and a half miles of the shop, and every batch is molded there in small runs. The people who make it are the same people who answer hello@steadilabs.com.
Use it for a month. If it doesn't do what this page says, email hello@steadilabs.com and it gets made right — no forms, no fight.
Veteran-founded · Patent pending · Made in Orange, California
The wake rolls through the sandbar and the drinks settle back where you parked them — and at five o'clock, the walkthrough finds a boat that looks exactly like it did at ten.
Get yours at steadilabs.com →Checkout is on steadilabs.com — Steadi Labs is the company that makes it.