Why a sideline drink can still tip
Match your holder to the surface, not just the cup.
A wider footprint is only one part
Steadi adds a wider base around a compatible drink. That does not make uneven ground level, stop a table folding, or seal a cup. The useful question is whether the complete base is supported and the drink is away from the activity around it.
Soft equipment is not a table
A cooler bag, collapsed wagon fabric or a sagging chair seat can change shape as people reach or equipment moves. Use a firm level support instead. If a cooler lid is the surface, move the drink before opening it and follow the cooler maker’s instructions.
Give every reset a quick check
A new seat, a different coffee cup or an added bottle boot changes the setup. Measure the base, check seating and look at the surface again. Choose another location when it needs balancing; the holder should never be what makes an unsuitable spot seem usable.