So do I. I have an offcut of lino on the floor of my garage then a waterproof mattress protector and on top of that I have a piece of fleece and then the bunny business play pen. Works well for me and my piggies.
as a temporary lining for a playpen, then towels are ok but I personally wouldn’t use them for a permanent cage. It’s not the absorbency that is the issue, its the drying. Towels tend to just sit wet and not dry very quickly. You’ll want idWhat do you use on the bottom as a lining? I'm debating towels but is this absorbent enough for them?