Why some bleachers lack cup holders—and your practical choices
Individual stadium seats and open bench seating leave different places for a drink. Work with the seating you have, without assuming every bench is the same.
A seat ring and a bench are different interfaces
An individual stadium seat may have a built-in ring or armrest holder. Bench seating may have no assigned drink space at all. Inspect the actual arrangement rather than assuming that a product for a molded seat will fit an aluminum bench.
Bleachers can have mounted holders
The old claim in this URL that bleachers never will have cup holders is too absolute. Manufacturers offer bench-mount hardware, including under-rail systems. Installing it is a venue or seating decision; a spectator should not modify public seating.
What an individual spectator can control
Check permitted accessories and usable space. A freestanding Steadi can be an option for compatible drinkware where its whole 5.2-inch base rests on a level supported spot beside you. A compatible approved mounted accessory may make more sense when seating space is limited.
Choose before you arrive
Compare holder types, measure your drink’s bottom and check the organizer’s entry rules. When the row is crowded or no suitable spot exists, keep control of the drink rather than putting it in a walkway. These checks are more useful than a universal promise about bleachers.