Choosing a portable cup holder: freestanding, clamp-on or luggage-mounted
Start with where the drink needs to stay: on a resting surface, attached to furniture, or carried with luggage.
A wider base at your stopping point
A freestanding holder such as Steadi slips onto compatible drinkware and rests on a suitable surface. It is useful when you want to move the same holder between supported spots without installing hardware. Steadi accepts container bases 2–3.15 inches across and needs room for its 5.2-inch outside footprint.
A holder attached to a chair or rail
A clamp-on holder needs a compatible attachment point as well as a compatible drink. For example, RoboCup describes its clamp as attaching to round surfaces up to 2 inches in diameter. That is an attachment specification, not a drink-fit range or evidence that every chair is suitable. Follow the accessory maker’s full instructions.
A holder that travels on luggage
Luggage-mounted carriers solve a different problem: carrying a drink with a suitcase. Freehand’s published Drink-Caddy specifications describe luggage handles 4–8 inches wide. Check the exact luggage interface and drink limits. Steadi has no luggage attachment and should not be substituted for one.
A folding mounted holder
A product being portable or foldable does not mean it is freestanding. Some fold-away holders require screws or a fixed mounting point. Decide whether you can install hardware and whether the intended surface belongs to you before choosing that design.
Make the decision before buying
Choose freestanding for a suitable stopping-place surface, clamp-on when the right attachment point is available, and an appropriate carrier when hands-free transport is the actual need. Steadi does not seal an open drink or promise universal surface support.