I've been trying really hard to commit to re-usable grocery bags for a long time. I've had them in my apartment and my car, but I've often forgotten to get them out and use them up until I walk up to the check-out counter. Sporadically, I'd pull them out, but I was never super consistent with it.
My family has always had this motto of "waste not, want not" and I take it to heart for a lot of things in my life; food, material things, time, etc. It only seems natural not to waste waste too.
Plus, it's plastic. And knowing that plastic will never degrade in my lifetime also makes me feel bad about the plastic waste I produce...that my children and grandchildren will have to live with for their lifetimes too. Sure, most plastic waste is unavoidable (every freaking car on the planet is plastic), but grocery bags are a plastic that I don't have to waste.
So I'm committed (read: enslaved) to reusable grocery bags. And they hold so much stuff!!
*Steps down from soapbox*