I'm trying to be more "Green" around here but one place I really fail is with disposing of the litterbox contents. I use clumping litter and when I clean the boxes I put the clumps in a plastic shopping bag and put that in the trash. What could I use besides plastic bags that would be okay for the environment?

Keep in mind that I clean the boxes daily and I take my trash off once a week so it has to be something that won't stink or has to be reopened every day. Also, I don't want to change the type of litter - the cats react badly to change (so do I).

Any ideas or suggestions? What do you use?