Every question, answered.

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 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.

It follows the same rule for any container: base width decides it, and the range that settles in fully is 2 to 3 inches across, with the fins flexing to accept a base as wide as 3.15 inches. Plenty of kids' insulated tumblers and handle-less cups fall inside that window; sippy cups and a lot of smaller kids' cups run narrower than the 2-inch floor and sit too loose. The sticky-note test works the same way on a kid's cup as it does on a can — check the specific one at home the night before, not on the dock.

Different jobs. A koozie manages temperature — keeps a cold can cold and a hand dry — and does nothing about the can's footprint or weight, which is why a koozied can still skates on wet vinyl the same as a bare one. This manages the footing: the wide base and the fins hold the can steady whether it's koozied or bare. Run the fit check with the koozie already on, since it adds a little width to the base.

No — fresh or salt, the rule is the same. Spray, cooler slush, and a rinse at the swim ladder are all fine; it just doesn't float, so it stays inboard of the fencing the same as a phone or a set of keys. Coming off a saltwater trip, a quick rinse at the hose handles any residue, the same as rinsing off sunscreen or lake grime.

It's one piece of flexible molded material, with no springs, no clamps, and no metal hardware to seize up or corrode from lake or salt water. There's nothing inside it to wear out from being packed into a tote bag and pulled back out for the next trip; the same wide base and fins that grip a drink on the first rental do the same job on the fiftieth.

That's a practical way to use the color options — eight to eleven people sharing one cooler on an unfamiliar boat is exactly the situation where a color makes a drink identifiable at a glance, whether it's parked on a bench, the cooler lid, or the table. The color choice doesn't change how it grips or fits; that part is identical across every one.

The problem shows up on both. A four-hour rental still clears the no-wake buoys, still gets its cooler cracked open in the first few minutes, and still faces whatever wake rolls through if another boat passes on plane. The length of the trip only changes how many rounds of drinks it holds steady, not whether the deck, the bench, and the rail are short on real places to set one down.

That's not something to expect on a rental. The fix boat owners actually use — a screw-in or drop-in recessed holder — means drilling into the console or the furniture, which a rental fleet isn't doing between bookings, and a renter can't do to a boat that has to go back at five. The molded holders the boat ships with, usually a handful sized around 3.5 inches across for a bare can, are what's available for the day.

A standard 12 oz can runs about 2.6 inches across the base, and the slim or "sleek" 12 oz cans common in hard seltzers run about 2.25 to 2.26 inches — both comfortably inside the 2-to-3-inch range. A 40 oz tumbler like the Stanley Quencher measures roughly 3.1 inches at the base, which is why it needs the fins' flex above the fully-guaranteed range rather than sitting inside it.