&gt; In theory I would imagine you need less waste liners than shopping bags.<p>Fair point, I do accumulate plastic bags, and I offset by switching to paper bags (which we use for accumulating small recyclable items).  You can also use them for other purposes (lunch bags, etc).<p>&gt; I think people might prefer the specifically designed waste liners<p>You are probably right.  I think I am an edge case, but I like the affordance provided by the grocery bag handles, and they make it easier to tie the bag up once you are ready to throw it away.