FMH - Cap for tumbler straw (or oil pump!)

Do you know that? You buy flaxseed or other oil in a 5L container, super convenient... But what happens? That pump always leaks!

With this simple solution, you can close your pump so it no longer leaks, and it also looks super funny!

Of course, it can also be used for its intended purpose, to close the straw of your tumbler! ;-)

1 cap, random color.