Every question, answered.

That's the whole reason the base is wide instead of narrow. A hung hammock has no flat spot, so anything narrow slides straight to the low point — you. The wide flexible footprint spreads across the curve instead, and the fins keep the drink from rattling loose as the bed sways. Rock it off level and it settles back.

Spreader-bars are the more tip-prone family — the bars hold the fabric taut and raise the whole bed's center of balance, which is exactly why the classic backyard hammock has a reputation for dumping people. This resists tipping on its own footing no matter which hammock it's riding in, but it can't change what the hammock itself does — that part's still on you and the bars.

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

No. Nothing ties to the ridgeline, bolts to a stand arm, or clips to a spreader bar. It rests on top of whatever's under it — the fabric, your chest, the ground, the cooler lid — so it works the same whether you're strung between two trees or set up on a stand.

Yes — it has no allegiance to either. Gathered-end or spreader-bar, hung from tree straps or set up on a steel frame, the base doesn't care what's holding the hammock up, only what's under it in the moment.

That's one of the better cases for it. Rest it on your chest, on the ground beside the hammock, or wherever else you can reach from inside the cocoon, and a hot drink doesn't have to ride in your hands the whole time or get passed in through the bug net.

A graze from a passing dog or kid is exactly the kind of bump the fins are built to shrug off — it resists tipping and settles back when the bed sways. It isn't magic, so a hard direct hit is still a hard direct hit, but the everyday clip-the-edge bump is the job it's shaped for.

Rinse it off or run it through the dishwasher. It's one piece of flexible material with nothing to come apart, so grass, dirt, or campsite dust wipes off in seconds.

It's called the Steadi, molded in small runs in Orange, California by Steadi Labs — veteran-founded and patent pending. Every order ships free from steadilabs.com, with 30 days to send it back if it doesn't earn a permanent spot in your hang.

The mechanism needs something to rest across, not a specific fabric — it's built around ripstop nylon and quilted rope beds, both of which give the wide base a continuous surface to lie on. A loose, wide-diamond rope weave is a different case: if the gaps are small enough for the base to bridge a few strands at once, the same principle should hold, but that specific weave hasn't been separately verified, so set it down and check before trusting it with anything open.

A standard 16 oz Ball mason jar measures about 3.38 inches across its base — over the fins' 3.15-inch flex ceiling, so it sits too wide to seat properly. Anything with a base in the 2-to-3-inch range grips the same way a can does; the mason jar's wide foot is simply outside that window.

No — stopping that is specifically what the fins are for. A Hydro Flask or a 32 oz Nalgene set bare on a hammock, the ground, or a cooler lid rolls the moment the surface tilts even slightly, because a round bottle has nothing to stop it once it starts moving. The fins grip the bottom inch of the base instead, so the same bottle sits held rather than free to roll, even while the bed sways underneath it.

No — the fins close around a round base, and a juice box or a soft pouch doesn't have one. A kid's straw cup with a round bottom in the 2-to-3-inch range settles in fine; a rectangular carton or a flexible pouch just isn't a shape the fins can grip.

No — the fins hold on to the shape of the base, not by friction against a dry surface, so condensation on the glass itself doesn't loosen the grip the way it loosens a hand or slicks up a cooler lid. That's specifically why a sweating glass of iced tea is one of the containers confirmed to fit.

Yes — sand is one of the surfaces it holds on, the same wide base and fin grip that work on grass or packed dirt work on sand. It's the domed cooler lid and bare fabric that give the base nothing to spread across — the ground material underneath it isn't the limiting factor.

It's a fair one — most people don't discover the drink problem until they're already strung up between two trees, so it pairs with a hammock, a stand, or a camping setup someone already owns rather than needing to match a specific brand or rig. There's no stand arm, ridgeline, or knot system it depends on, so there's nothing to check about the recipient's setup first.

That's exactly the kind of movement it's built for. A two-person hammock sways more than a solo rig simply because there's more weight and more independent motion in the bed. The fins hold the container regardless of how much the surface underneath is moving; what changes with a second person is how often the bed rocks, not whether the base can keep up.

There's no elastic band or foam pad inside it to stretch out or compress — the grip comes from the shape of the fins flexing around a base, not from a part that loses tension the way elastic does. That's a structural difference from anything built around a stretched loop or a foam liner.

There's no fabric, foam, or stitching in it to hold moisture — it's one solid piece of material, so rain or sprinkler overspray runs off instead of soaking in. Let it dry the way you would any solid plastic yard object and there's nothing damp trapped inside for anything to grow in.