I use two long and deep rubbermaid bins for litterboxes. They work great! I used to use Feline Pine and am thinking about going back to it. I only switched to the scoopable because Buddy, my foster kitty, hated Feline Pine and started peeing outside the box. After ruling out a UTI, I changed to scoopable. Everyone was happy. Buddy has since gotten a new home and I think it's safe to go back to Feline Pine. It's better for my 16 year old kitty Mollie Rose's allergies.

Feline Pine is great. You take out the solid waste and when the pellets turn to sawdust, you toss the whole box out and start over. Yeah, I think I'm gonna switch back. It's alot less messier than the scoopable too.