We used this portable playpen in the hotel / friends' home when we traveled with our 1yr old Cavalier king charles spaniel this summer.  Large was good size for him to have water & food bowls, bedding, and a little walk area.
Zipper doors are well designed.  Attached side pockets were convenient to store small things.  Water dispenser hole itself seems sturdy, but the side panel does not seem to hold the weight of bottle. This made our travel a lot easier and simple. Wish we found this earlier...