Q I don't know how to fold it back.
Please check below folding instruction video.
Q Is this water proof? How do I clean it?
No, this product is not water proof but you can always wash with water and dry out in the air.
Q How many cats can it contain?
It really depends on how you use it but normally 2 cats without Portable Cat Litter inside.
Q Is the portable litter included？
No, the Portable Cat Litter is sold separately.
Q Are there straps to attach to the seatbelt for driving?
Yes, there are straps in the back for driving.