Simply attach the Lil Sucker to your container being sure to slide it from the bottom of the container upwards, peel it down to within about a hlaf inch or close to the bottom of the container and suction will hold it steady on any non-porous surface at any rate of speed…within the legal limits of course! The closer the Lil Sucker is to the bottom of the container the better suction you will get. It’s a great way to prevent spills! Fits over standard size cans, tumblers, and cans in koozies.