Drink setup for a boat-rental day
Separate permission, travel and the marina break.

Ask the operator
Check what drinkware and accessories are permitted on the rental. No-drill design does not automatically establish approval.
Inspect the intended travel holder
Check the actual boat holder and the container’s insertion depth and handle clearance. Steadi’s diameter range describes its own container fit.
Use a table during the break
A marina table gives a separate resting place. Keep the full base supported and boarding routes clear.