Why a coffee cup can still spill
Treat the whole setup as the decision.
Use a clear reach
Keep the cup outside a sleeve, book or laptop cable’s path.
Support the footprint
Allow the full 5.2-inch base on a level surface. A narrow chair arm is not enough merely because the cup fits.
Clean separately
Hand wash Steadi. Dishwasher-safe drinkware does not make the holder dishwasher safe.