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I reckon that if rats want to get into anything less than a very
substantial plastic or, of course, metal container they will.

The best compost bin we ever had was a simple
kit of 5x squares of strong mesh wire, about
48x48" per side, and with about a 1" mesh.
Clip together the 4 sides, then the base. Fill
the thing up, turn your back on it, and the
level had sunk. Took a couple of years to
finally fill it. When dug out there were
thousands of tiny red worms at the bottom.
Are they what are called Tiger worms?

--
Tony Williams.