How to save on sleeping space when camping. The amount of gear needed when camping as a family can be overwhelming. That's why our portable sleep solution is also a space-saving wonder. With these four steel pieces, you can safely stack Large or Extra Large Disc-O-Bed or Disc-O-Bed Single cots in minutes. Simply fit the U-clip ends onto the four, patented bed discs. As it clicks into place, you know it's secure.