Every question, answered.

That's the surface it's built for. Bleacher planks are narrow and offer no cup holder of their own; the wide flexible base spreads across the plank instead of balancing on it, and the fins keep the drink from working loose when the row stomps for a close play. It resists tipping and settles back to level.

Yes — the wide footprint rides over clumps and uneven ground instead of tipping into them, the same way it works on the bleacher plank or the cooler lid. Uneven, moving surfaces are exactly what it's built for.

No. Nothing clamps to anything. It sits on top of the chair arm, the plank, the grass, or the cooler lid, and packs flat into the chair bag when the game ends.

Measure the base, not the rim. A base of 2 to 3 inches across fits — the 40 oz Stanley does. Handled travel mugs don't; the handle gets in the way of the fins.

It holds steady in the wagon bed the same way it does on the bleacher plank — the wide base spreads across whatever's under it, so it isn't depending on a shallow mesh pocket to keep a drink from sloshing over gravel.

Standing up fast is the design brief. The base bends with the surface and rights the drink when the plank rings or the chair shifts. It's not magic — a direct kick is still a direct kick — but a row jumping up for a two-out rally, or free baseball in extra innings, is exactly what it's built to shrug off.

It's one piece of flexible material, nothing to assemble and nothing to lose. It stows flat in the chair bag or a wagon pocket between games and unpacks in a second at the next field.

Rinse it or run it through the dishwasher between tournaments. It's one piece of flexible material with nothing to come apart.

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.

It sits on the lid the same way it sits on the plank or in the grass — the wide base isn't depending on the lid holding still. What it can't do anything about is the lid itself opening: if someone's about to dig for ice, move it to the wagon bed or the ground first, same as anything else standing there.

No — a gallon jug's base runs well past even the fins' flexed limit, so it's an honest no. It's better off riding in the wagon bed or staying under the pop-up until it's time to refill, same as it already does.

Yes. Narrow steel player bottles sit inside the 2 to 3 inch base range, so the fins grip the bottom inch instead of leaving the bottle to balance on its own narrow footprint — which is exactly what tips it over standing alone in soft grass.

Yes — foam and paper fountain cups have a flat base that lands inside the 2 to 3 inch range, same as everything else on the fit list. It's the classic case for needing one: thin-walled, uninsulated, and set down exactly where the row's feet land between innings.

Regularly — a base at each kid's spot in the wagon, one for every parent's chair along the fence, a set for a team mom stocking the dugout, or a gift before a travel season starts. Multiples and checkout are handled at steadilabs.com.

It's one piece of molded flexible material — nothing hinged, clamped, or clipped on to loosen or snap over a season of packing it into the chair bag weekend after weekend. The same reason it doesn't depend on clamping to a rail is the reason there's less on it to wear out.

No. A 9U pool-play weekend runs the same 8-to-12-hour shape as a 12U bracket weekend: same bleacher planks, same chair line, same wagon ride to the far field. It's holding the parents' coffee and the sideline Gatorade either way, not the kids' equipment.

Because a clamp only grips the one width it's sized for, and the complex doesn't have just one width — a bleacher plank runs about 9.5 inches, a folding chair arm is narrower, a wagon rail is different again. That's part of why clip-on buying guides lean so heavily on clamp strength as the selling point: it's the part most likely to fail once it's asked to fit somewhere it wasn't sized for. A base that grips the drink instead of the rail works the same way across the plank, the grass, the wagon bed, and the cooler lid.