Does anyone else use plastic grocery bags as used diaper bags?

We were given a "diaper genie" type of diaper pail, but the refills on those things are SO expensive. So my hubby took out the top thing under the lid of the diaper pail, put plastic stick on hooks (the cheap kind you peel the back off of and stick up in the shower or back of a door as a hook, etc) put one on each side of the top thing from the pail, and we now can hang plastic grocery bags inside of the diaper pail instead of those pricey refills. I have two babies and so we would be buying those refills a LOT. (yes plastic grocery bags are not good for the environment but neither are those genie refills either. And I will NOT even entertain the idea of cloth diapers. I have twins. There is NO time for those). So do you use them?