Sitpack is simple to use, but you'll need to try it out a few times to become a Sitpack champion. Here is a short video to help guide you :)
If the telescopic tube is not locked and put to use, or unlocked completely when closing it - the tubes will be pushed into one another. The leg will rattle and not be able to lock or close before repairing it. Sitpacks is not broke, it just needs adjustment.
Please watch this short video and learn to disassembly and repair your Sitpack.