Coroplast Alternatives PVC sheeting

I know alot of people love coroplast but we wanted something that you can fold up and take outside easily, since the used shavings will go in the compost pile. Fleece sounds too involved to me, we are currently using aspen shavings and I may introduce a litter box soon.

Anyway, since we want him in a bigger cage asap (we put him in a cat carrier so we could take the too-small cage back to petsmart) I don't think I'll have time to get any advice here. I guess I'll post about how we do with our cube and pvc cage! If the pvc works out ok I'll have hubby make a wood bottom so we have some kind of better bottom than just clipping sheeting to cubes.