eco-friendly wax wraps (Britannia)

Various sizes of these things ... which I have tried to use in place of clear plastic bags, but which have one large drawback: you can't see what's wrapped up in them!

You don't know if the mysterious bundle in your fridge is the remains of a ham, or half a tuna sandwich.

(In fact, I haven't actually used these for either purpose – they're mostly virgin.)

Also I don't like the smug exhortations to virtue they're printed with.