1.5L plastic bottle works like a charm when you don't have a plunger around and you needed one urgently

it actually works better and faster lol

That's the thing lol, you don't need a good seal with bottles

I dono the scientific term but the long cylindrical shape of the bottle, and more air inside somehow helps


Just cut the top liddis (2nd arrow where it separates the top and bottom part)

Go try now on a clean toilet. Just shove it and plunge up down cincai half-assed effort. It works faster than an actual plunger lol.