The new cardboard one where you poke your fingers in the side to get the lid off, and the plastic ones where you need to flick the tabs up.
I can't get them open. However much I follow the instructions, I cannot open them. I have tried one handed, both hands, asked dp to show me - slowly. He does it easily.
Is it just me?! I can change spark plugs, tighten sink pipes, hang wallpaper but not these. Impossible.