Kitchen Oil Funnel

I use oil when I'm cooking with my cast-iron pans, so I keep a little bottle of oil near the stove. I made a funnel to make it easier to fill, that fit underneath the bottle lid so it doesn't get lost.

It has a bump down the side to prevent the funnel from sealing against the edge of the bottle. The bottle opening is 23mm but you could scale this funnel to whatever size bottle you have.