I do no use a liner.
I don't think it's a good idea for them to eat the newsprint !

As promised ...here are some photos from yesterday's bin-switch

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left -- clean bin ( tulle fabric under lit keeps the occasional ff escapees out ) right-- lid w/ air holes
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L - dirty bin R ---- air holes on the side of the bins
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more useless cricket helpers! 'fur balls'

I would highly recommend NOT employing any 'fur balls'.
They are useless ! But sweet ( that's Chewie and Cubby ....my boys... )