In Canada this is an issue. The 'reusable' bags aren't cloth -- they're still a weave made from plastic. And it can be tied to culture and availability. It's much easier to 'remember' your bags if you're making a dedicated trip to the grocery store from home. But, if you want to spontaneously stop in after work, for example, you would have had to remembered a bag before you left home or had one on you at all times. We should be encouraging the type of city design that allows for (and encourages!) this type of spontaneous shopping. We should figure out the bagging system to match. Recyclable/compostable paper bags seem like a good thing.