Here are 3 plastic lids for 3 popular cups/mugs.
The lid for the Heineken pot is from a Penn tennis ball can.
The lid for the Snow Peak SP-600 mug is from a Folgers Coffee plastic jar.
The lid for the Snow Peak Mini Solo Titanium pot is from a Maxwell House Coffee plastic jar.




The lids all stay on pretty well and can eliminate the mesh stow sack if desired. I don't believe they will take the heat of cooking with them.
Do you have any other examples of plastic lids fitting cups/mugs?

